Vigina Tighting Help?

So I’ve slept with 3 differnt guys 1st in august of 08 ( first time ) me and this boy only did it once and it lasted like 4 minutes. 2nd in januray 17 09 ( second time ) me and this boy only did it once and it lasted like 6 minutes. 3rd in march ( third time ) 3 differnt guys 2 black ( the first too times ) the third one was purto rican. when me and the third did it I was tight but me and him have done it a lot and were still together and were gunna keep doing it but im afraid ima keep getting to loss cause I already am loss but he says hes likes it either way but I dont think so and im afraid he might get tired of my vigina. so how long does it usally take to get your vigina tight again. I dont want it to sag either so im trying to figure out what to do, we love eatchother a lot and when we make love it makes us stronger but im getting scared so what can I do to make my vigina tight and how long does it usally take for a vigina to get tight again.