There are many. It's very portable, can be inserted up to 6 hors before intercourse--low hassle, the effect is immediate and reversible, it has o hormonal influence and can be used while breast feeding, and its has few serious side effects..
No hormones, easy. The cervical cap is no longer one of the more popular birth control methods but it is a low cost easy method that many can use. It can be inserted up to 6 hrs before intercourse. It is hormone free and effectively blocks sperm from passing into the uterus. Each cap can last about 2 years. It can not be felt by your partner.