pls suggest me, i am doing sex from last 3-4 years and i haven't any problem during the sex. i can easily move penis foreskin back during sex, in while normal time my penis foreskin rolled back to penis head.  but if i don't rolled back foreskin then penis head become dry with touching with underwear and its painful. my penis foreskin lower part still attached with penis after 3-4 year of sex life.. but now my frnd told me that it's very important to break foreskin with penis because penis will more grow after separate with foreskin and i haven't any problem when penis head touched with underwear.

now please suggest me what can i do.. i will still continue with it or contact to doctor for separate penis foreskin. thanks