What form of contraception requires a waiting period after intercourse to be effective?

• A. Diaphragms
• B. Oral contraceptives
• C. Implants
• D. Injectable contraceptives

Answer: (A)

The diaphragm is a barrier method of contraception that requires the user to insert it before intercourse, and it needs to remain in place for a specific amount of time after intercourse to be effective. Generally, it should be left in place for about six hours after sexual activity to ensure that it can adequately block sperm from entering the uterus. This waiting period distinguishes diaphragms from hormonal methods like oral contraceptives, implants, and injectables, which work systemically to prevent ovulation and do not require any specific timing or waiting period after intercourse to be effective.

Oral contraceptives require consistent daily dosing to be fully effective, typically starting before intercourse, while implants and injectables provide a long-term effective solution without needing a waiting period post-intercourse, as their hormonal action is continuous once administered. Therefore, the diaphragm is unique in its requirement for a waiting period after sex, making it the correct choice in this context.