This is one of those deals where it couldve been just the heat of the moment that made you do it,or you could just have a little bisexual in you(pardon the pun). If,however, you say you're not turned on by men at all,and it's true, then you're probably straight and it was a one-time deal. Either way, it's not the end of the world if you enjoy boys every now and then.
I'd do it again if I were you, and let it happen as it happens. Just besafe and wear condoms, and make him do the same..

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