Freeuse is a fetish in which a person is always available for sexual activity, regardless of what they're currently doing. For example, if someone is washing dishes, reading, watching Netflix, cleaning the house, or anything else, their partner can simply walk up to them and initiate sex without hesitation.
The term "freeuse" originates from adult content and refers to situations where sexual activity is unrestricted and consensual for all parties involved. This concept is highly fetishized in adult or hentai manga, as well as some erotic fan fiction, but it's important to note that it's purely fantasy and doesn't reflect or encourage such behavior in real life.
There's also a fetish called "used and ignored," which stipulates that the freeuse partner must not react in any way while being used. For example, if they're washing dishes and their partner walks up behind them, pushes them over the sink, and starts having sex with them, they will continue washing dishes (as long as possible) without saying anything or reacting to the fact they're being fucked.
Freeuse is often a form of objectification, where one person takes on the role of an object, providing sexual gratification to another person at any time.