I know this completely unrelated but bare with me... this reminds of an episode of Shameless (USA version) where one of the main character who is closeted ends up having sex with the supposedly straight guy because they were in the "moment".
Could be your friend is gay, and you were caught in the "moment". Are you sexually attracted to him or ever find males sexy to you?
Straight people do engage in sexual activities with gay people too to get off not necessarily cuz they're gay. Pleasure is pleasure I guess. Doesn't really matter if that person is sexually attractive or not. You really should confront him bout it. If he can do that you, you're wayyy past awkward.
i feel pretty scarred reading this thread
quite simply; if you're sexually attracted to guys and girls you're bisexual, if not then no.
a guy could jerk you off and you could enjoy it but if you weren't sexually attracted to him then it doesn't make you bisexual.