Quote:

its very possible though vaginal sex but anal sex has been more common for transmitting the virus because well... anal sex is bigger and better than ever these days and more people are doing it, instead of just the gay community.



I haven't paid much attention to the field since the early 1990s so this may no longer be true, but it was believed that the reason anal sex has a much higher transmission probability is that anal sex often involves micro-fissures or micro-tears to colon (which may not result in visible blood), and those tears are good pathways for HIV to make it into the bloodstream.

Vaginal sex is less likely to involving micro-tearing (that’s where the cock is supposed to be, except in porn) so HIV is less likely to make it into the bloodstream.

For female->male transmission I simply don’t remember if anal sex has an enhanced probability or not.
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