As for oral sex, I don't know where you heard the suggestion than 8% (that is 8 out of 100 exposures, almost 1 in 10) of persons with oral expsoures to infected partners acquire HIV
but that is
absurd. The quoted figure for HIV
risk, if one has oral sex with an infected partner is less than 1 in 10,000 and, in my estimation that is too high. Neither of us on this site have ever seen or reading the medical literature of a convincing instance in which HIV was passed by oral sex.