The percentage or HIV transmission through intercourse is not so high. That is, if not anal sex. The reason to back up the intense HIV proficiency in gay community is that they have anal sex.
Because the strenghth of anus mocosa is one-tenth of that of vagina, anus is even more vulnable.
Beside, blood vessels are concentrated in anus, encouraging virus coming into vessels.
To prevent the transmission, the use of condoms is crucially important, just like heterosexuals.
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