try kegel exercise just tightening your vaginal muscles as if you were going to pee look it up for better instructions
The Vagina is a muscle so just flex and release over and over again. At the very least every other day for 5 to 10 minute's. Longer and more if you want.
Well are you a male or a female? it depends.
I was told it was from blood making it swell from sexual activities.
Vitamin E oil and syran wrap..... Or just do cardio and stop looking for short cuts
A yeast infection can.