How to know if your woman recently sex another guy within a week

To know this is very simple. Normally when a had sex her vagina will go back to the usual shape after an hour or two. And if she has not had sex for a very long time it will still go back to the normal shape. The problem is how to detect the normal and abnormal shape.

Abnormal shape
you will struggle to penetrate her at first but it will get widen inside the moment it pass through the main vagina opening.

Normal shape
it will hard to penetrate both from the opening to the main vagina hole.