Sleepgasm

The instantaneous transition from orgasm to sleep. The sleepgasm is an evolutionary trait that male humans have adopted. Being able to fall asleep very quickly after sex made mating much easier by not having to talk to the woman after mating. Sleepgasming could increase a males mating frequency ten folds by not having to listen to that stupid bull shit pillow talk.

Jane was very mad at John for having a sleepgasm before she came.