A female condom (also known as a femidom or internal condom) is a barrier device that is used during sexual intercourse as a barrier contraceptive to reduce the probability of pregnancy or a sexually transmitted infection (STI). Meant as an alternative to the condom for males, it was invented by Danish MD Lasse Hessel and is worn internally by the female partner to prevent exposure to ejaculated semen or other body fluids. Its protection against STIs is inferior to that of male condoms. Female condoms can be used by the receptive partner during anal sex.