It's definitely a real thing, but you'll rarely see it unless you're somewhat close to the sex industry or really into porn. I've seen it in porn, stripping, and prostitution. It means a person who is normally straight that performs sex acts (or in the case of stripping, gets nude and does some booty shaking) with people of the same gender for money. Some will even advertise themselves as gay for pay for their audience that fetishes it. It also tends to get them more money :'P.