When someone comes out as pansexual.

when you're hungover as shit after a spending a night drunk as a skunk

When a person - gay or straight - comes out as a gainer or encourager. Gainers are sexually attracted to being fat and getting fatter while encouragers are attracted to fat and making someone else fatter. Some people are both! This is essentially coming out about a specific part of one's sexuality.

When a heterosexual reveals they are straight as opposed to being gay.
When a person who pretends to be gay is found out to be staright. Metro sexual.

The lesbian equivalent to coming out of the closet.

When a girl admits shes a lesbian.