QUOTE : Vaginal tissue does not stretch out with use, no matter how much you use it or how large the penis or toy is that it’s used with. For comparison, think of your mouth and how it is stretched and manipulated every day, yet it retains its shape—the same goes for your vagina. But like any muscle, the PC muscles that surround the vaginal canal can get weaker with age and after giving birth. Doing Kegel exercises regularly can help keep the PC muscles from losing their grip and might make your vagina feel “tighter” around a penis if clenched during sex.