There is a protein in semen that makes HIV thirty million times more contagious. This is why it is not impossible to contract HIV from oral sex. Other men's semen should be avoided at all costs unless you just don't care or know for a fact that he is negative.
That being said, you're obviously bisexual. You do still dig women, right? I mean, you may just be straight up gay, like me. If you decide to embark on your journey off homosexual sex, then be sure to use a condom and don't ass fuck if you have to take a crap. Take a crap first and use an enema to clean out your hole. Even that doesn't guarantee cleanliness, but it's a start.
Finding a homosexual sex partner is tricky, but it can be done. You have to pick up on subtle mannerisms and eye movements. For example, if you keep catching your 'straight' best friend staring at your crotch bulge over and over, then congratulations, you have a lead! At some point, however, you have to make the first move, and success is not guaranteed. Craigslist is another option, but it's more desperate than finding you male lover out in the wild, and less fun.
To me, anal sex at first feels like having a harpoon pierce my anus and all my muscles down there are tight / are contracted. Once your lover established a rhythm, these muscles and the anal sphincter relax and you find that you can easily take a big dick. Also, many people regard homosexual sex as a grave sin. They might be right, I dunno.
