J&J Effect
When two exes keep having sex even though they're not together. They're like a couple who forgot they were broken up. Add alcohol and it's like a party with no exit.
I saw your ex at the bar. We had sex. You didn't even notice.
We're not together, but I still show up at your house every weekend. Why?
We're like a broken clock. We keep ticking, even though we're not together.