Movie: American Pie 2 (2001)
Calling something gratuitous in an American Pie movie is a little like, as they say, handing out speeding tickets at the Indy 500. In this scene, Jim, Stifler and company want to see some sapphic action from hot neighbor ladies, who oblige on the condition that a couple of the boys do the same. This comes fairly early in the movie, after Jim's dad has walked in on him having sex at college but well before Jim injures himself when he tries to masturbate with superglue.
Yes, but does this advance the plot? Wait, what plot?