I like women. Find just about every inch of the female form hot. In the same token, men do nothing for me sexually but when it comes to which of the two I'd rather just interact with generally on a casual basis? Definitely other dudes. It's just on average easier to come to understandings and generally vibe. Doesn't apply to family and girlfriend of course because I know them on a deeper level, but among the general populace I'd much rather befriend other men.
I can get how dudes opt to become gay from this pretty common mindset.