Gender identity isn't always simple
http://www.gaylinkcontent.com/prdetail.cfm?id=9858
A survey of over four thousand straight men found that around 10% of them actually had sex with another man. I know a few men who are no longer allowed to donate blood (something I feel strongly about, mainly because I can’t for other reasons) just because they had sex with another man. It didn’t matter if they had AIDS and STD tests, haven’t done it over a year, or anything else. Because they were snuggling with a man… never again. It is something that has always bothered me.