Internal condoms, also known as female condoms are soft, thin latex-free, and hormone-free polyurethane pouches that are worn inside the vagina to prevent the entry of semen into the womb. Female condoms are 95 per cent effective and protect against both pregnancy and STD. Remember that a small of semen can still come out of the penis even before a man fully ejaculate. So, the condom should be put inside the vagina before sex. Do check for expiry date and tear or defect on the condom before inserting it.