Starting with oral sex (French) but then part way through getting uncomfortable, stopping, and then putting on your pajamas and going to sleep in separate beds (British).
Gordon: "Did you end up bangin' that chick from Kelowna at camp?"
Dave: No, man, we just had Canadian sex: I was just about to blow my load when she asked me to go down on her. I tried to, man, but when I looked at that thing, I wasn't getting any nearer. I just said I was feeling sick, and I went to lie down on the couch."