i have found that women who are dancers and/or practice yoga or pilates are more likely to have the ability to flex their "sex muscles" as a former lover used refer to them.
I have wondered along similar lines, in particular, whether women athletes in general typically have tight vaginas and/or the ability to control the flexing of their vaginal muscles.
This question reminded me of a sexually particularly enjoyable time in my life. Toward the end of my first marriage I had an affair with a very interesting, intelligent, and attractive younger woman (I was 55, and she had just turned 34.). She had been married, and faithful to her (less than faithful) husband, for a period of five years, but both before and after her marriage she had had numerous lovers.
Childless, she had a delightfully tight vagina; it fit like a snug sheath along the full length of my penis, and thanks to regular Kegel exercises, she had wonderful control over her vaginal muscles, able to squeeze me even more tightly whenever she wanted to. She was even able to "milk" my penis, squeezing me from the base of my penis down to the head.
I recall that in one of our sessions of love-making, I cummed after, I would suppose, my usual time of 5 to 6 minutes (I say that because that's been normal for me most of my life since being circumcised at age 24). She indicated her satisfaction and, having been on top, lay down about half on me and half beside me, snuggling close in my arms, with my penis still in her vagina and still firm. We stayed that way long enough for me to doze off and then awaken. I'd happened to notice the time when we started our session, and after waking, I noticed that the time was over an hour later and thatto my surpriseI was still firm inside her.
I remember saying to her, "Wow, I've stayed hard in you for over an hour!" She said something like, "It's been great! I've been squeezing you to keep you hard. Let's do it again." She sat up on top of me, and we started in once more. After cumming this time, I withdrew from her, and we lay side by side till we began once again a half hour or so later. After the third time, I had to leave to get back to my wife. My mistress and I met again 3 days later, and just about the first thing she said to me was, "You're going to have to be very gentle with me today, because I've been quite sore ever since Sunday." Needless to say, I was gentle, and we had another lovely session of multiple couplings.
I'm getting horny now, just thinking about her once again.