>>850108>>851302While she didn't support NoFap, there was a a verry degenerate sexologist here in Norway who without meaning to described a great reason: YOUR BODY LEARNS HOW TO ORGASM FROM PAST ORGASMS.
Your hand is not a vagina, and when you fap you often sit or lie on your back. So really, you're training yourself to orgasm from things that are not sex, and so, it will become harder for you to orgasm from sex over time if you don't have an active sex life and just fap.