It's a personal taste thing, but what are to you the gigglingest side splittingest laugh-till-your-sides hurt (intentionally) funniest sex scenes that you've ever seen.
my choices:
damn near all of the original "American Pie"
(tho the pie scene did absolutly nothing for me)
i do believe my personal favorite is an old Woody Allen film
(his first i do believe) called "Take the Money and Run"
woody's character and the character's girlfriend are doing it missionary style and woody develops a nasty leg cramp (of course, hiliarity ensued )
Well, i've showed you at least two of mine, show me yours