Manforce condoms for men are extremely effective contraceptives when used correctly. Manforce condoms are regarded as a barrier method of contraception. The manforce condom is a thin barrier that is worn on an erect penis. It is put on before sex and removed shortly afterwards to prevent leaks. When a man ejaculates while wearing a condom, sperms become stuck in the condom's tip, preventing them from entering the vagina. Every time you have sex, you must use a new Manforce condom. According to the federal drug administration, using male condoms as the sole means of contraception has resulted in a pregnancy rate of three percent.