>>55919Jesus Christ. The vagina is extremely elastic. When a woman is aroused, the vaginal canal widens naturally, so that's a thing already. It then returns to its typical size.
Even if stretched, quite a bit, it will return to original size unless damaged. Repeated damage will compromise the elasticity of tissue. So long as the vaginal canal isn't forcibly stretched/damaged, it will not loosen.
Now with age (generally post-menopause) there can develop problems with pelvic floor muscles but that's a different issue and it can be avoided/treated to minimize damage.
Pussies don't go loose, unless severely damaged.