Hey, not at all crazy- I do it too. Sometimes it's a purely physical thing- it's just THAT GOOD. I've only cried after sex a couple times that it wasn't from the orgasm, and that was when my boyfriend and I were going to be apart for months at a time (we live in different states because of college). So sometimes it's emotional, but more often than not it's a physical thing all the way.

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I am certain of nothing but the holiness of the heart's affections and the truth of imagination. What the imagination seizes as beauty must be truth - whether it existed before or not.
-John Keats