What is masterbation and what effect does it have on the human body. What are some positive and negative effects it has on the human body?

What is the answer to this particular question i have in health

Which of these is the best example of sexual objectification? a) a female initiates a conversation with another female. b) a male proposes marriage to a female. c) a female makes repated coments to a male about his appearence. d) a female proposes marriage to a male.

What is the proper way to determine that someone is unresponsive before administering cpr