We humans aren’t just motivated to have sex for pleasure and procreation (although those are two very common motivators). A new study from Evolutionary Psychology reveals that men and women perform “duty sex,” which is when one engages in sexual activity out of obligation or “a desire to maintain one’s romantic relationship.” There could also be duty sex engagement if someone views their partner as more attractive than they are, and therefore more appealing to other people.

The Study

The peer-reviewed journal conducted a study with 252 participants (176 women and 76 men), with ages ranging from 18 to 24 and the average being 19. As for orientation, most identified as heterosexual. Participants were in relationships ranging in length from 0 to 84 months.…