Drs say there is no harm in masturbation.i do it twice a week. but next day i pee more than usual n sometime i feel pain in lower leg(below knee) why?

Masturbation: Masturbation is a natural event. If you're noticing frequent urination and leg pain, these symptoms may or may not be related to the act of masturbation. You may benefit from a visit to your doctor.

You're fine: Enjoying your body is normal and healthy. Think about something wholesome, maybe that one special person in your future, rather than internet trash. After ejaculation, many guys will want something to eat or drink. I bet that is why you pee. At your age, you don't need to be afraid of your healthy sexuality or let superstition warp who you are. Love responsibly and well.