The girl you are sleeping with but she is not your main girl or wife. Normally you go out to a club and you meet a girl and have
sex with her. Although the
sex was great because you have a main girl or wife you cannot make this chick you main girl so she becomes someone you can have
sex with but not a long term relationship. Usually this is a smut who has slept with many other people that
ar in your circle of friends.