My wife and I were having sex about 3 weeks ago and I gave her what I thought was a good, but not outstanding orgasm, and her orgasm-face continued on and she started crying. Then she was embarrassed for ruining the moment and cried some more.

(Things have been going bad for her at work, her training, etc so a dam opened.)

After several minutes of cuddling and crying, she was still teary and again apologized. "Dont worry" I said, "I'm telling myself I'm so huge I made you cry!" - the tears immediately changed to laughter.

This has happened several times over the years. The rush of emotions brings out stuff that is un-expected. Sometimes it's tears, sometimes anger, sometimes depression.