Easy one. Pecs and biceps. That's assuming you have at least a solid year of three day a week, whole body training under your belt. Just a quick pump up routine before you go out to screw:
Superset: Flat Bench/EZ Curl Bar Curls
Superset:
Flat Bench Flyes/Concentration Curls with Dumbells
Superset:
Push ups/Incline Curls.
Repeat each Superset three times. Shower and out the door to screw. This routine is not for regular use. Only before a date if you haven't hit the weights in a couple of days and YOU'RE ALREADY DOING THE GOLDEN SIX.