A condom is a thin sheath worn on the penis or, in internal form, inside the vagina. Latex is the usual material. Polyurethane and polyisoprene exist for people who react to latex. Used correctly, condoms cut the risk of pregnancy and many STIs, including HIV.

Oil-based lotions tear latex. Water-based or silicone lubes do not. Space at the tip catches semen. Air left in that tip can encourage a burst. Expiry dates on the wrapper are not decoration. A wallet is a poor home for months of heat and bending.

Internal condoms have flexible rings and a different learning curve. They can be placed before anyone is in a rush. Either type beats a speech about trust when you do not have recent tests in hand.

Put it on before any genital contact if STI risk is in the room. Pre-ejaculate is not a myth of convenience.