Masturbation is a normal physiological activity. Only, physiologically or emotionally sub-normal people do not masturbate. Vasectomy makes a man impotent. In fact, by removing the fear of pregnancy, sexual desire and the performance are increased. Men have stronger sexual urges than women.
Sexual urge is equal in both the sexes.
Anal sex is only practised by homosexuals. Anal sex may be practised by heterosexuals also. Oral sex is a perverted act. Oral sex is a normal act and may be practised when both partners are interested and free from infections. A normal man should be able to get an erection whenever he wants it.