Body changes after sex

Is it true that once a woman has lost her virginity, her body changes as they get thicker? I lost my virgin two weeks ago and I never really had an ass. But my mother commented on how my ass looks perkier and in overall “bigger”.

I also have a cousin that when she lost her virginity, people noticed as she got thicker around her abdomen area and ass. That when people saw her abdomen area they were like yup she not a virgin anymore, and it was around when she lost it.

Do we really get wider?