How long does it take a girl to get loose?

A vagina doesn't get loose unless she's given birth. And that is not a lasting effect. If you are in pain during sex it is most likely because you are not aroused and wet enough. Lube can never replace natural discharge. You can try having a orgasm first before he enters. Men sometimes say they think their woman is loose when she's wet but that is how it's supposed to be. Wet and swollen makes it pleasurable for you and easier for the penis to be inserted. If he wants tighter just squeeze your muscles.