First of all the issue is that you never have sex with your friends just to clear up.
(Me) Being (a) homosexual, I don't get why would somebody do it to an other male if he is indeed straight. I wouldn't do it to my straight friends, even if they were "curious" because I can distinct my friends from my sexual interests (opposed to what homophobic cliches say about homosexuals which have zero basis). If it was a prank while he was sleeping or something this would be an other case, there's no sexual involvement in the case, but I know that we do sex because we want to and Tea Bagging makes no exception.
...and the worlds shall reconnect