End sex
Similar to break-up sex but for fuck buddies that were never in a romantic relationship. Both parties agree this will be the last time they will have sex, thus changing their relationship from fuck buddies to just friends.
Girl: I'm over being fuck buddies.
Guy: ok but we need to have end sex so it's official.
Girl: ok
Guy: ok but we need to have end sex so it's official.
Girl: ok