Wylie conducted an extensive survey on 26,032 participants aged > 16 years in 26 countries from the Americas, Europe, Asia, and Australia. As many as 38% of the participants engaged in oral sex as a sexual activity. Oral sex has a very high prevalence among all sex orientation groups. ¹⁴ Meanwhile, data by Richters et al. reported 19,307 Australians aged 16 to 59 found 32% of the respondents had oral sex from their last sexual history. ¹⁵ According to D'souza et al., there are differences in oral sex behavior compared to gender, age, and race. Oral sex behavior exists in married couples or adults and adolescents, and young adults. ¹⁶ In a report from the Child Trends Data Bank in 2015, adolescents aged 15-19 years, both boys and girls, reported having oral sex as much as 39% and 38%. Women said giving more oral sex than men. ¹⁷

In developing countries in Africa, such as Nigeria, it is reported that the influence of the media and the Internet affects a person's sexual attitudes and behavior. Out of 400 respondents, 352 people had oral sex. Some of them learned this behavior from the internet. ¹⁸ In Addis Ababa, Ethiopia, a study reported oral sex among high school adolescents in 3840. Adolescents who had practiced oral sex is 5.4% (190) person. Oral sex is closely related to the concept of best friends (AOR = 5.7; 95% CI 3.6-11.2) and having illiterate mothers (AOR = 11.5; 95% CI 6.4-18.5). ¹⁹ Besides that, oral sex behavior is one of the activities carried out and offered by sex workers. In some countries in Asia, the percentage of women who engage in oral sex varies 5% in Indonesia, ²⁰ 16% in Thailand, ²¹ and 18% in India. ²²

In adolescents and young adults, NBC (2005) reports that 40-47% of young people who do oral sex do not need to worry about pregnancy, meet the right person, and feel the sense for the first time. Other reasons, many couples in serious relationships want to experience sexual pleasure but are not pregnant, ²³ experience sex without using a condom, ^{23 - 26} maintain virginity, ^{24 , 26} answer curiosity about sexual activities, ²⁴ then believed that oral sex has a low risk of STD transmission. ^{23 - 26}

In teenagers, having oral sex is related to increased popularity, ²⁷ improvement of relationships between teenagers, ^{24 , 25} engaging in sexual activity without commitment, ²³ assumption that oral sex is not sex, ²³ and also sex with someone is a generous behavior. ²⁷ The same perspectives and motivations were also found in married couples. Holway and Tillman reported on the timing of oral sex in marriage among young adult couples. Their report stated that women who were late or never performed oral sex reported being more satisfied with their relationships with their partners. The fundamental reason is they do not feel forced when having sexual intercourse and do not need to worry about the transmission of disease due to sexual relations. ²⁸

Meanwhile, oral sex is behavior that risks transmitting various diseases. Teens and young adults even claim oral sex is less risky and more acceptable than vaginal sex. Sometimes they perform oral sex because they do not want contraception and protection while having sex. ²⁹ This fact shows the need for health workers and counsellors who provide the correct perspective in education or sex counselling. ^{28 , 29}

Penhollow et al. also conducted a study on 408 students. They asked students' involvement in religious activities, frequency of worship attendance, their feelings about religion, their perception of God in sex and then looked at their participation in several sexual activities such as oral sex. ³⁰ Results indicated that religiosity variables, mainly frequency of religious attendance and religious feelings, were significant predictors of sexual behavior such as oral sex. ¹⁸ The religious factor was reported as one of the reasons a person does not engage in oral. ¹⁶ Apart from that, another influencing factor in higher education. ²⁸

Attitudes towards oral sex tend to vary in population. The study surveyed 8600 people aged 16-64 years regarding their sexual activity. The analysis results stated that oral sex is one of the mandatory activities in sex activities besides kissing, cuddling, and vaginal intercourse. About 74% of their respondents reported that women want stimulation over their genitals orally, and 70% stimulate their partners' genitals orally. ³¹ This proves that genital mouth stimulation is widespread in married couples. ³²

Another study on young couples reported that every young couple had at least one oral sex session a year. ²⁸ If oral sex is practiced mainly by women, even sometimes ingesting ejaculate to prevent pregnancy. ^{28 , 33} men are reported to prefer oral sex and partners who engage in oral sex. ³⁴ However, there is no gender difference in oral sex. ³⁵ For several couples, oral sex is an indicator of the satisfaction of sexual life. ³⁶

One study reported 368 women in the 45-59 years age group (19.5%), 60-74 years (2.2%) and 75 (over 0.8%) had at least one oral sex in a week. ³⁷ Whereas in 341 men surveyed, the age group 45-59 years (20.1%), 60-74 years (6.5%), and 75 years (8.8%) perform oral sex at least once a week. ³⁷

Men at risk for adultery are more likely to engage in oral sex. ³⁸ Oral sex can be used to detect infidelity, material retention behavior, and orgasm with sperm retention. Oral sex, which is used as s detector for adultery, is indicated, for example, in cunnilingus activity; one study states that men are still likely to feel and smell their rival's semen around the vagina related to their previous sexual activity. ³⁹

Many studies have reported that couples during oral sex mostly do not use condoms. However, Auslender et al. reported different results. The results were all in young adults when oral sex took protective measures to reduce the process of transmitting diseases such as Herpes simplex such as microbicide surrogate products. ⁴⁰

In 2015, a study enrolled 346 men and women regarding their expressions and attitudes towards oral sex, either receiving or doing for the first time. They address various expressions: happy, fearful, indifferent, strange, disgusted, surprised, relieved, proud, and sad. The most common expression for oral sex recipients was feeling happy (38.7%). Interestingly, 10.8% thought this behavior was disgusting, and 8.2% thought this was strange. In another case who did oral sex, dominant among them felt fearful as much as 17.1%, 15.8% felt indifferent, 2.8% felt disgusted, and only 12% felt happy doing it. ⁴¹ Others reported on a focus group discussion study involving women with experiences of fellatio and cunnilingus. They stated a feeling of good emotional vulnerability when engaging in oral sex on their partners. ⁴²

During oral sex, the aim is to orgasm for the partner. Richerts et al. (2006) conducted a study on a large population. 50% of women experience orgasm during vaginal intercourse, but when intercourse is added with cunnilingus activity, 73% will experience orgasm. Oral sex strengthens the increased incidence of orgasm in partners, especially in women. ¹⁵

Many reports have stated that oral sex can be local infections, rather a cunnilingus, fellatio, or anilingus. Pathogens that are often transmitted through oral sex are viruses ( Herpes simplex viruses, Hepatitis virus, Human papillomaviruses, and less frequently HIV) and bacteria (mainly syphilis, gonorrhea, group B Streptococcus). ^{43 , 44} In addition, infections such as Molluscum contagiousum, Candidiasis, Epstein Barr virus, and Aspergillosis can also be spread through the process of oral sex. ⁴⁵

Gonorrhea infection is possible in oral sex. Sex workers with inconsistent condom use for oral sex were reported 17.1 times more likely infected (95% CI: 8.0 ± 36.5) than consistent condom users to develop pharyngeal gonorrhea. ⁴⁶ HSV-1 is transmitted through genital and oral contact. This lesion is one of the most prevalent lesions among women, even young. ^{47 , 48} HSV-1 is more likely to spread to the female genital organs than male genital organs. ⁴⁹ For young people, acquiring a lifelong recurrent infection such as genital herpes is not only an unfortunate surprise diagnosis, it can also invoke anxiety, guilt, and social-sexual isolation. ^{50 , 51}

Unusual infections have also been reported after oral sex. The incidence of pharyngitis with Trichomoniasis vaginalis was reported in men who routinely had oral sex with their partner who had vaginal Trichomoniasis. ⁵² So far, it is infrequent for Trichomoniasis to spread by mouth and cause a local infection. In addition, parasites such as Toxoplasma gondii is found in ejaculate fluid, possibly spread through oral sex. ^{53 , 54} There may be a positive association or association between Toxoplasma transmission and oral sex behavior, especially fellatio. However, this condition depends on the activity of fellatio, whether it will be sperm swallowed or not.

A severe infection has been reported by Froissart et al. They reported two cases of severe infection that occurred through oral sex activity. The first case complained of fever, pubic erythema, penile edema, and cellulitis and the second case complained of genital bubo, foreskin edema, fever, glans erosion, and cellulitis. Both of these cases occurred after performing fellatio activities with their sex partners. In this case, the suspicion of the transmission process was an abrasion of the penis during traumatic oral sex. Cellulitis of the pubis is an infrequent case. The trauma of the genital organs due to the bite of the partner is presumed as a port de entry. ⁴³

Severe soft tissue infections such as Fournier's gangrene were also reported by Lutz and Gerber (2020) through oral sex with commercial sex workers. This male patient experienced swelling and sloughing of the skin of his penis after reportedly engaging in oral sex. During intercourse, his partner nicked the shaft of the penis using her teeth. ⁵⁵ Takenouchi et al. also reported a rare infection, Lemierre syndrome, in a 58-year-old man after oral sex with a sexual partner two days previously. ⁵⁶ Lemierre syndrome is characterized by thrombophlebitis of the internal jugular veins and bacteremia caused by anaerobic organisms following a recent oropharyngeal infection. ⁵⁷

Cunnilingus should be avoided in pregnant women. Hosseini and Hunt reported a case of Streptococcus mitis Chorioamnionitis in a 43-year-old pregnant woman who had oral sex with his partner. This infection occurred ten days before contractions after dental scaling and oral sex. ⁵⁸ The same case was also reported by Gherman et al. in Australia that infected by Streptococcus viridans after cunnilingus. ⁵⁹ Both Streptococcus mitis and Streptococcus viridans are normal flora in the oral cavity.

WHO's guidelines for adolescent sexual and reproductive health and rights in 2018 recommends giving antibiotic prophylaxis to children who experience sexual abuse with the suspicion of one of which is oral sex, WHO considers that oral sex by unknown offender has a significant risk of sexual transmitted disease. ⁶⁰ According to Barbara et al., oral sex was the riskiest behavior than vaginal and anal sex. Cunnilingus has an OR of 2.199 and fellatio of an OR of 2.756 to have infected. This study reported that people who performed oral activities have higher risks associated with STD/HIV transmission than those not. ⁶¹

Other serious risks that arise due to oral sex behavior include human papillomavirus infection, which causes oral squamous papilloma, oral verruca vulgaris, condyloma acuminata, focal epithelial hyperplasia, epidermoid carcinoma, and oropharyngeal squamous cell carcinoma. ^{62 – 64} One study from Indonesia proves a strong correlation between the activity of oral and anal among homosexuals and HPV infection (OR 6.854). ⁶⁵ According to Brown et al., women who had more than three times oral sex with their partners in the previous month had a higher risk of developing oral HPV than those who had less. ⁶⁶

Meuleman et al. reported that oral sex might be a protective factor in recurrent miscarriage cases. This study was conducted on 97 women who experienced unexplained consecutive miscarriages. Recurrent miscarriage cases occur due to an imbalance of immunity in the embryo's implantation into the endometrium. ⁶⁷ Koelman et al. stated that exposure to oral sex could reduce the incidence of preeclampsia. ³³

Pittrof et al. performed a study on 619 women engaged in oral sex. They have a lower risk of developing endometriosis and pelvic inflammatory disease than their counterparts. The assumption that oral sex can be a protective factor is that endometriosis and PID require adaptive immunity in the lymphoid system. ⁶⁸ Meanwhile, the oropharynx is a channel that is rich in lymph channels, thereby facilitating the stimulation of adaptive immunity. Primed lymphocytes in the nasopharyngeal tract will be found later in the endocervix. ⁶⁹ In addition, it is possible to induce genital T-cells and B-cells through sub-lingual immunization. ⁷⁰

Testosterone also affects the libido of women. Testosterone in semen can logically affect the libido of the sexual partner. Women who did not use condoms at the time of intercourse had more sexual intercourse than women who did. ⁷¹ But there are no specific reports in the case of women who swallowed semen. Semen also had an antidepressant effect, such as serotonin. It has been reported that women whose partners used a condom during intercourse were more likely to be depressed than those who did not use it. ⁷¹

Some interesting substances are opioids such as endorphin, enkephalin, and other cytokines also present in semen. These substances affect sperm motility, such as endorphins and calcitonin. ⁷² Endorphin and enkhapalines function to reduce anxiety and induce analgesia and drowsiness. ⁷³ Likewise, with oxytocin, oxytocin is a hormone that plays a role in increasing bonding and intimacy in partners. This hormone impacts penile erection and female orgasm. ⁷⁴ However, in the case of semen ingestion, the activity levels of these substances will be significantly reduced in the blood due to the absorption, distribution, and metabolism processes.

Besides that, several benefits are felt during oral sex, such as satisfaction in intercourse and emotional or pleasure in intercourse. A study on 410 women who had oral sex showed that their male partners delay orgasm so that the intercourse time is longer. ⁷⁵ Oral sex is a positive activity that provides sexual satisfaction and relationships. ^{76 , 77}

Another benefit of oral sex is sperm retention by male partners. ⁷⁸ Cunnilingus is considered one of the activities that help women experience orgasm. ¹⁵ Reports show that oral sex helps sexual activity last longer than usual. ⁷⁹ Another study reported that 233 men who had oral sex with their partners would spend more time having sex with them, doing more copulatory behavior that replaced semen, and reported greater sexual arousal. ³⁸ Men engaging in oral sex with their partners as part of strategy provide a more comprehensive range of benefits. Men who are higher in consideration are more likely to benefit their partner. ⁷⁹

Oral sex is currently independent of age and gender. In adolescents and young adults, the reason for having oral sex is wanting to feel sexual pleasure but not getting pregnant or losing your virginity, doing intercourse without contraception, and having minimal risk of STD. In addition, there is also a reason for “friends with benefits” and popularity among peers. In late adulthood, oral sex is reported to be one of the mandatory activities besides kissing, cuddling, and vaginal intercourse. Oral sex is also one activity that supports orgasm in a married couple. The expressions felt by those who had oral sex varied from feeling happy, afraid, and feeling strange. Oral sex is also reported to be one way to detect cheating in a relationship. One of the risks posed by oral sex is infection. Some have said the benefits of oral sex include increased immunity and a reduced risk of recurrent bleeding and preeclampsia.

No data are associated with this article.