a notch on someone's bedpost
informal A sexual conquest, typically one of many: I didn’t want to be another notch on his bedpost...- Having a great sex life isn't about following trends or carving notches on bedposts.
- His was not the kiss of a callow adolescent or a selfish boy bent on earning a notch on his bedpost for being the first to defrost her.
- She turns away again and I can see that she is carving a notch on a bedpost.
See parent entry: bedpost