Friction Portals occur from having sex without lube in such a manner that friction builds up to a point in which the space time continuum breaks and/or rips, forming a Friction Portal to another time or dimension.
Side-effects include: pregnancy, Drowsiness, Dizziness, Herpes, and Friction Portals.
person 1: I will fuck your mother!
Person 2: I will fuck you in your mother!
Person 1: How does that work?
Person 2: I fuck so hard, I create friction portals.
Person 1: I think, if you're making friction portals, you definitely need some lube.