is it possible for the woman vagina (inside) may decrease the tight everytime she doing sex or more?
Answers:

Bad Discharge?

Yes.

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Did u ever carry out CPR on a late pregnant woman?

Yes, it does lose the tightness.
Especially after childbirth. :-/
However, it IS a muscle so if she does her kegel excercises after it should get tighter over time.
Here's a website explaining what the kegel excercises are:
http://en.wikipedia.org/wiki/kegel_exerc...

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