Which of the following are the least commonly used contraceptives at present?

Currently, male contraceptive pills are not commonly used. They are either not very effective or cause side effects. Moreover, pills are not acceptable to many men. Male pills contain testosterone or progestin or GnRH analogues. Some male contraceptive pills use hormones to suppress the production of sperm, while others aim to disrupt the transport of sperm within the reproductive tract. Gossypol is an extract from cotton seeds that inhibits spermatogenesis. However, it can also cause side effects such as fatigue, decreased libido, and permanent azoospermia.