Why you always have the urge for sex?

It depends on how old you are, if you are a teenager then your testostarome levels will be very high, if you dont know what this meens well basically it means that when you are a teenager you have something called hormones and a certain type of one of these will be very high, which is normal and it kinda enhances your sex drive as high as mens is already. This is also similar for women exept a different hormone and is usually not as high of a sex drive. Although if you are not a teenager then I guess your just horny =P