Condoms are used at roughly equivalent frequency as for vaginal sex, it is reported in the online edition of Sexually Transmitted Infections. However, the authors of an accompanying editorial argue strongly that this conclusion is premature, and point out that unaccounted-for anal intercourse could skew the findings of microbicide trials. Studies aim to give information that will be applicable to a large group of people e. Because it is impractical to conduct a study with such a large group, only a sub-group a sample takes part in a study. A product such as a gel or cream that is being tested in HIV prevention research. It could be applied topically to genital surfaces to prevent or reduce the transmission of HIV during sexual intercourse. Microbicides might also take other forms, including films, suppositories, and slow-releasing sponges or vaginal rings. Receptive anal intercourse refers to the act of being penetrated during anal intercourse. A clinical trial which aims to demonstrate that a new treatment is no better or worse than an existing treatment. While the two drugs may have similar results in terms of virological response, the new drug may have fewer side-effects, be cheaper or have other advantages.


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You might encounter a couple who enjoy it, are well studied about it, and are vocal in regards to the pleasure principle of it. You could run into the exceedingly religious man who continually waters the sexual philosophy that anything outside of the missionary position is a sin, and anal is definitely and will always be a non-negotiable. We know—hopefully through common sense or with a click on any free porn site—that concept is modern urban mythology at its finest. Ass it turns out pun fully intended , all kinds of people are doing it: White girls, Black women, Christians, atheists, gays, straights.