No culture "parties" more than any other... I've been to all through Europe, Japan, and Brazil... By far, Brazil was the most partying culture. The US doesn't stand a chance next to Brazil (Well, maybe New Orleans), but that's it... Europeans party JUST as much as anyone else. Brazilians more than all the above.
How can having a good time be a cultural thing. Hell, the best party I've ever seen in the US was hosted by a group of Indian people... They had more liquor and drugs than any other party I've ever been to in the States.
I bet they'd have made Titus' parties look like 5 year old girl tea parties... The shit was off the chain.
Oh, and I guess in the genre you're talking about, I too will have to say porky's, but if you just mean a teen movie where people talked about sex a lot... I'm going with Weird Science.