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Anal sex is currently a hot topic of discussion for it is increasingly prevalent among young men and women, and older adults. 1 in 2007, a study based on the national survey of family growth (nsfg), found that one-third of u. 2 in the study, starting from the age 15, the percentage of participants reporting heterosexual anal sex. Having anal sex can increase the risk of bacterial infection, pregnancy, and sexually transmitted infections, and it can worsen hemorrhoids. Redefining urological history taking anal intercourse as the cause of unexplained symptoms in heterosexuals. All of whom had engaged in unprotected heterosexual anal intercourse prior to the onset of their symptoms. Although anal sex and vaginal sex both often involve insertion, a transgender woman is, as is true of all people, never required to engage in any sex act at any time. The future role of rectal and vaginal microbicides to prevent hiv infection in heterosexual populations. Prevalence and correlates of heterosexual anal and oral sex in adolescents. Heterosexual anal intercourse (hai) is not an uncommon behavior with 36 of women and 44 of men 2544 years old in the united states reporting ever having hai in their lifetime (). There is evidence that the prevalence of hai may be increasing in recent years, which may be due to a true increase in the behavior over time or heterosexuals becoming more comfortable reporting the. Penetrative anal sex has a higher risk of spreading stis than many other types of sexual activity. This is because the lining of the anus is thin and can be easily damaged, which makes it more vulnerable to infection.   urinary tract infection in young healthy women following heterosexual anal intercourse case reports. Urinary tract infections (utis) are among the most common bacterial infections in outpatient clinical settings globally. For heterosexual men, 20 of hiv infections were associated with insertive anal sex with women. Sensitivity analyses showed that varying any of 63 inputs by 20 resulted in no more than a 13 change in the projected number of heterosexual infections in 2015, including those attributed to anal sex.   heterosexual anal sex has been identified as a risk factor for hiv infection and other stis (e. , human papillomavirus infection) 3, 710, abnormal anal cytology , and anal cancer in women.