Everybody's heard of being in the closet. Like when you're gay, but you keep it a secret, so no one knows about it.
Well it's not just gays anymore. Lots of straight guys, that I know personally, are stuck in the closet. They can't admit to the world, and some can't admit to themselves, that they're straight and that's okay.
Often referred to as "Nice Guys (tm)", these poor kids have repressed and denied their sexuality because of oppressive social standards.
Normally standards like "My boyfriend is such an insensitive asshole" or "Why can't I meet any nice guys?", but they can range to "I hate it when guys are nice just to get in your pan