Speaking for myself, I think I would. I agree with Lycan - not that I'd be somehow frightened by discovering a lesbian propensity in myself, no - I would actually welcome it wholeheartedly - but it is just not there.

And I know a few guys who are, like me, 100% straight.

And in all of these cases - mine and of a few guys I know - the orientation started very early on, in preschool. I have read a lot about people who are trying to determine their orientation in adolescence and beyond, but I cannot relate to it at all.