*Paging nurse Wicked Wanda*

She quite likely can give you some insight.

My own advice will be to think about the night of the 3some and try to remember if there were any positions were you might have been tightening the muscles in your abdomen (like you would doing crunches), even if you weren't in the crunch position. You might have been tensing up without realizing it.

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Put me on wheels and I'll turn tricks.

Clever? Nah, I ran out of that years ago. But if you find this, let me know, k?
"The road goes ever on..." ~ Tolkien

In memory of my friend skip...
Go then, there are other worlds than these