According to Freud, we have this so-called “Erogenous zone” which is a part of our body that receives pleasure. It is in any part of our body that when sometimes touch or anything done to it, we feel this electrifying pleasure. And when that pleasure in that body part where triggered, it is already called “Sex”. So, technically, if your erogenous zone is in your arm, and when someone let’s just say accidentally touched your arm and then you feel pleasure, then you and that someone who touch your arm already had sex.