Answer: c. It involves sexual stimulation of a man's genitals by means of oral manipulation
Step-by-step explanation:
Masturbation simply refers to thw stimulation of the genitals in order to derive sexual pleasure by an individual. This may either lead to orgasm or not.
It should be noted that masturbation doesn't cause warts, blemishes, and blindness in men. Also, it doesn't have same physical responses like having sex with one's partner.