The name of a pelvic floor muscle and exercise, named after Dr. Kegel who discovered the exercise. These muscles are attached to the pelvic bone and act like a hammock, holding in your pelvic organs. A common function of these muscles is stopping and starting the flow of urine.
In men, the benefits of Kegel exercises include increased ejaculatory control. In women, a strong Kegel muscle can aid in efficient child birth and gives the vagina a better "grip".
Amy can make me cum just by working her Kegel muscle while I'm inside her.