Thank you Siân.
" Compulsive behaviour". That's exactly what I intended to express. So, is it the best for me to seek out the help of a professional psychiatrist? Or, should I go to see a doctor who deals with sexual dysfunction?

Yes... maybe I'm a little bit abnormal. Three or four years ago I started masturbating and had a lot of fun. Back then I masturbated three or four times a week and it was really relaxing and refreshing. But now things have changed. Seems that I have grown fed up with sex. Masturbation does not bring...