Markings left by a woman.
That bird i copped off with last night has left huge great slug trails on my bed sheets / laminate flooring / kitchen worktop / car bonnet / face delete as appropriate
When a man becomes intimately involved with a woman he will then after sex produce Slug Trails which are also known as Cum Stains.
Ex. #1 Dude, I totally left Kim with Slug Trails all over her belly.