Women who were currently doing pelvic muscle exercises scored much better on sexual satisfaction questions than women who did not.
Women with incontinence (probably thinner muscles) scored the worst on the sex questions.
Thus you can understand the importance of strong vaginal muscles.
The ring of muscles around the vaginal opening contract during orgasm and may contribute to the intensity of an orgasm. This can be a matter of opinion based upon the input of a sexual partner, or one’s observations of vaginal tone.
This is covered by more connective tissue and blood vessels.