The stereotype that a woman who has lots of sex gets "loose" is totally false. You can't tell how much sex a woman has by how tight her vagina is. It's totally an individual thing like breast size, and we get 'looser' when we're really aroused, because we have to be to let the penis in!!! It goes back to normal size after sex, though.
I think that stereotype came from men who think so highly of their penis that they believe it has magical powers to change our bodies. Give me a break.
But perhaps not after childbirth? Or so I hear. I can believe that a baby might do some more permanent stretching.
But like I said, just squeeze it while he's in there. He'll feel it. It's not about size, it's what you do with it. Lol!!!