I watched this movie years ago when I was a kid, and I don't remember its name but I remember that I loved it.
It is a 70s/80s American comedy movie about some guys in either high school or college (it reminds me of movies like Animal House or Revenge of The Nerds when I think of it). They have a virgin friend that apparently has an either really small or really big penis, and in the end of the movie he has sex with a brunette girl inside a school bus in a forest while everyone is waiting for them outside the bus, and he keeps going on the bus to get condoms because he never manages to find one that fits right.
Also, I remember that they go to a strip club, where the virgin guy pays to see the breasts of a stripper and another guy complains that the virgin guy is paying too much just for a tits flash. Then, they all end up having some problems with the owner of the strip club (as I recall, he is a fat old man that looks like Hitchcock and wears a hat and a white tuxedo), and one of the man's bodyguards beats one of the protagonists, so they decide to take revenge on the club owner and, I don't remember their plan or the whole scene, but I remember that they make the guy's limo falls off from a small bridge into a lake and that they communicate using bird sounds during the mission.
Also, I may be wrong, but I think that this movie is a sequel, because I think that there was a "2" by the end of its name.