Sometimes you want to cum on their face, or on their chest, on their crotch or on their ass. Sure, everyone has their own preference on what to do after cum, sometimes you would like your partner to swallow it. You would think after sex, people would have their energy drained but in porn-you would love to see what is thereafter sex, and one of the things being usually done is to exchange cum. Sometimes the hotter thing in sex is not the actual moment of having an orgasm but what cums (pun intended) after it.