I'm 16 years old and have been masturbating for about 4 years. It's been like this for a long time. Are other people like this?
It's very common. It probably has something to do with semen slightly irritating the inside of your urethra, causing your body to feel like urine is entering it, which triggers the feeling that you have to pee. Don't worry about it – unless you are experiencing discomfort on urination and have had unprotected sex recently, in which case you may have an STD and should see a doctor.
