Friendship. There are three friendship levels in casual relationships: none, resultant, and pre-existing. People in one-night stands and booty call relationships tend to not share a friendship with each other.

Is friends With Benefits a casual relationship?

Friends with benefits (aka FWB) is a casual sexual relationship with either a friend (duh) or just a random person. The general idea is that you are friends (or at least friendly) with the other person and have a sexual chemistry, but are not interested in pursuing a more serious, romantic, relationship.