should this phenomenon has to occur periodically, if yes then how frequent and if it doesnt happen then what are the reasons...Thanks

im 22 years old 5.9' inches tall and my weight is just 65 kgs. ive tried everything to increase my weight but i gain weight just for the time being....

why my penis is erect when i wake up early in the morning is it good or bad for my health nad what are the reasons and after how much time auto...