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If you are having any problems posting threads plz message Kate. since latest update we have had 6 members with problems, sorted those but yet to find the problem.
It is true that some young girls begin having relationships with men at that time. So while they may believe that having sex is the reason for the changes, it's really just a coincidence.
My perception would be that regular sex burns calories. So if burning more calories than replacing, then weight loss would reveal muscle tone.
It could then be perceived as gaining size as less tissue is covering muscle.
I doubt though it would build muscle unless repetition under muscle load is frequent enough to build muscle.
Some BDSM activity could build muscle tone I would think.