Coitus interruptus method of birth control

Options

A. involves uterus only
B. involves vas deferens
C. withdrawl of penis just before male ejaculates
D. barrier method

Answer

### Step-by-Step Solution:

1. **Understanding Coitus Interruptus**: Coitus interruptus, also known as the withdrawal method, is a natural method of birth control where the male partner withdraws his penis from the female's vagina before ejaculation occurs.

2. **Evaluating the Options**:
- **Option 1**: "Involves uterus only" - This option is incorrect because the method does not directly involve the uterus; it focuses on the male's action before ejaculation.
- **Option 2**: "Involves vas deferens" - This option is also incorrect. While the vas deferens is part of the male reproductive system, the method does not specifically involve it in the process of birth control.
- **Option 3**: "Withdrawal of penis just before male ejaculates" - This is the correct option. The primary action of coitus interruptus is the withdrawal of the penis to prevent sperm from entering the female reproductive tract.
- **Option 4**: "Barrier method" - This option is incorrect because coitus interruptus is not a barrier method. Barrier methods include the use of condoms or diaphragms, which physically block sperm from reaching the egg.

3. **Conclusion**: The correct answer is **Option 3**, which accurately describes the coitus interruptus method as the withdrawal of the penis just before ejaculation to prevent fertilization.