‍Which of the following is correct sex concept？‍ A: Older people do not need sex B: Adolescent sexual life does not require contraception C: Condom is a safe and effective method of contraception D: Women can have sex when they start menstruating

Which of the following is correct sex concept？ A: Older people do not need sex B: Adolescent sexual life does not require contraception C: Condom is a safe and effective method of contraception D: Women can have sex when they start menstruating