She's just a female friend who meets up every week and has sex. Sex buddies? Best friends? The compatibility of their sexual desires is on another level! They hate not being able to have sex once a week, so they end up restricting each other! The contradiction is that they can't stay apart, and they have a real, intimate sexual encounter! The most satisfying ejaculation is when they get close to each other and have a sticky sex session with a woman who has the best physical compatibility.