>>715580312I'm not sure if you know this...
Actually, of course you don't.
The vagina does indeed loosen with repeated use. It is designed to take that, but large insertions will cause the vagina to stretch out. Difference is, the anus is the exit of solid waste, and if that loosens even a bit, we have problems. The vagina can loosen to accomidate a woman's life partner's penis more regularly, as that's its job.