To him it is big. Side Effects and Benefits Masturbation is a fun and normal act used by many to explore their body and feel pleasure. Men who are self-conscious about the size of their penis, either in its flaccid or erect state, may experience anxiety-induced erectile dysfunction and other emotional problems. Sign in Log in with your Medical News Today account to create or edit your custom homepage, catch-up on your opinions notifications and set your newsletter preferences. And perhaps you will be reassured about your own size or that of your partner's penis.