Sans places a 'home of sexual' mat outside the front door to come out to papyrus and when he comes home he took it as a literal phrase and is like 'SANS!!! DONT MARKET OUR HOME AS SOMETHING DIRTY' and sans is all 'ok cool wont anymore. Btw im gay' and pap is like 'OK COOL' and spends the rest of this life thinking those two conversation topics were completely unrelated