So what do you think you're crying about? What is the trigger? What are you thinking about while your crying?
Is it a cry of pent up emotions & just a feeling of a release for you? Like it feels good afterwards?
Or does crying make you feel worse?
There's also a lot of hormones that r released during sex. Maybe it's the combination of them I don't know.
But I'd be looking for some type of trigger if this hasn't happened in other relationships.
Best of luck!