That's a hard question to answer without conducting some serious polls and surveys. Personally, I think we do.
I'm not sure how you define sex. There's penetration sex and then there's just playing around until both climax. For the sake of this post I'm going to include the later in the definition of SEX.
I'm a gay guy. When I'm not in a relationship i will seek out a sexual partner about twice a month, sometimes more, or if I have an FB (a F*** buddy for regular encounters) we'd get freaky about once a week or more. A rough estimate of how many times i have sexual encounters in a year I would say about 50 (when I'm single) Just penetration sex would be less than half that.
When I'm in a relationship it's 3 to 5 times a week (penetration sex about twice a week)
I don't know how often hetero's do the nasty but I know some that do it just as much and others that have to clear out the cob-webs from their shorts when they finally do get a piece.
Who knows, right?