So, "free use" aka "Freeuse" is a fetish in which a person is always sexually available, regardless of anything else they are doing at the time.
So, for example, if someone is doing the dishes, reading a book, watching Netflix, cleaning the house or anything else, their partner can just walk up to them and start having sex with them without preamble.
You can see how this concept ended up showing up in today's porn.
There's also a very favorite of mine which is the CFNM, but that's a story for another day. 🥸
Hang on, more videos below.