It’s actually a myth that girls vaginas become “looser” after sex, your bodies size is custom to the girl some are wider set than other girls and it only gets bigger during childbirth. The reason why virgins are suppose to be “tighter” is because during their 1st time they contract their muscles because it’s scary this is also why girls feel as though it hurts. The reason why non-virgins feel looser is because they are more relaxed and their muscles don’t contract as much instead they do the opposite and make room for the penis and considering its a natural thing for humans to do there is nothing wrong with it. You’re suppose to fit together not strangle your penis.