When you decide that you can skip going to the gym, because you had some sweaty, exhilirating sex, that you feel you've worked out hard enough, and have burned those calories just by banging
Trent: "Morning babe, want to go work out with me?"
Abby: "How about you just work me out and do some sexercise instead?"
1: Dude, I'm going over Linda's house.
2: Isn't she your lab partner?
1: Yeah, we're gonna be doing some experiments.
2: Maybe you could talk her into doing some sexperiments.