Very rarely with 100s of partners a year, yet this is "not uncommon" in the gay male community.
They are on average promiscuous on a level heterosexuals just don't get close to.
Perhaps because it's an election year, I've gotten into the habit of fact-checking statements which sound suspiciously like they've been pulled out of an ass.
Or, maybe I just lament the ending of Mythbusters. Either way, Myth Busted.
TL:DR version: They took some usage data from a popular dating site and discovered that both gays and straight people have roughly the same amount of luck getting laid. Science, bitch.