Coitus interruptus, commonly known as the withdrawal method, has a high failure rate for several reasons. The correct answer to your question is:
B. Initial secretion in male may also contain sperms
This method relies on the male partner withdrawing before ejaculation to prevent sperm from entering the vagina. However, pre-ejaculatory fluid, which is released before ejaculation, can contain sperm. This means that even if withdrawal is performed correctly, there is still a risk of pregnancy.
Additional Factors Contributing to Failure
- Lack of Control: It can be difficult for the male partner to predict the right moment to withdraw.
- Timing Issues: If withdrawal is not executed in time, sperm can enter the vagina.
- Human Error: Mistakes can happen, leading to unintended ejaculation inside the vagina.
Due to these factors, coitus interruptus is considered an unreliable method of contraception. It is important to consider more effective alternatives for preventing pregnancy.