I'm a 28 year old male, who has never been attracted to guys and still isn't.
However...about a year ago my current girlfriend asked if she could use this small vibrator in my arse while we made love. I was hesitant, cause...well WTF?! However with much dicussion (though mostly her dangling her goodies in front of me), I gave in.
Anyway, IT WAS AWESOME! I'm thinking the prostate pressure and overall senstivity of the backdoor area is what makes it feel so good.
Anyway, a year later we have progressed enough to where now she uses a strap-on with me. I have never found guys to be sexy in the least and it rather repulses me when I think about it. However with her and the strap-on...WOW I get aroused.
I'm thinking maybe it's a combo of the sensitivity and maybe the fem-dom situation of it that I like, not the "guy part" specificlly, as I think being Bi would mean I am sexually attracted to men in general, not the one part that can be inserted.
My girlfriend doesn't think I am Bi, and agrees with my previous paragraph, but I thoguht I would ask and see what you all thought, not that it really matters, as we will continue to do what we do.