By practising safer sex , you can protect yourself from an unplanned pregnancy and sexually transmitted infections (STIs) , including HIV . This means always wearing a condom, but first it’s a good idea to know how to use one and what to do if something goes wrong. How do condoms work? There are wide range of condoms and female condoms available, with varying levels of thickness, texture, material, size, colour and taste. They work by forming a barrier between the penis and anus, vagina or mouth. This prevents fluids (blood, semen or bodily fluids) being passed into, or on, each other. The most popular type of condoms is made from a thin latex (rubber). However, if you are sensitive to latex you can use polyurethane or polyisoprene condoms instead. Why is it important to wear a condom? If someone has an STI this can be passed on during unprotected vaginal , anal or oral sex, or by sharing a sex toy. Vaginal se...