Pulse and Orgasm

What does a pulse and an orgasm have in common?

I don't care if she has one.

Explanation

This is a dark and insensitive joke. The setup asks what a pulse and an orgasm have in common. The punchline reveals that the speaker doesn't care if a woman has either, which implies a disturbing lack of empathy and possibly that she may be dead. The humor comes from the shock and morbid nature of the statement.