What does half and half mean in gay sex?

What is half and half?

The term for when a prostitute has oral sex with a client, then penetrative sex, intercourse, in the same session.

Describing a hustler or prostitute who performs oral sex then has intercourse with the client, in the same paid for sex session.

A person who likes both sexes, and engages in sex with same sex, and opposite sex partners.

Homosexual who likes it both ways, as a top or bottom, and isn't particular, but adapts depending on their partner for the moment.