During sex, throw a load of tuna fish all over your partner's crotch and proceed to ejaculate all over the tuna, (mayonnaise-style). You'd be using tuna because of Charlie the Tuna from the 70's commercials. Then, right before blowing your load, yell out "Sorry Charlie!"
I was rushing to get to abstract painting class and did not have time to eat my lunch, so i brought my sorry charlie to class with me as soon as it was out of the oven.