Any bruise, scratch, or abrasion that is left on the body after sex. Because of their shape and location it is obvious that they have been made by another person during sex. They are sometimes seen as symmetrical scratches running down the back or as two identical and symmetrical bruises on the ankles, wrists, or upper arms. They differ from hickies in that they are accidentally made as a result of rough or too aggressive sex.
Nice sex mark! Your date must have went well.