Sexpert Dictionary: Bareback (verb) – Sex without a condom. The term is mostly used by gay men. Heterosexuals tend to use the words raw, or natural to describe the same thing.
I’m very glad that you had the forethought to ask for advice on this topic. Too often people think that a condom is the only way to decrease the risk of STI/STD transmission. That is a very dangerous way of thought because if they don’t want to use a condom then they won’t think to take other steps to decrease the amount of risk their taking on.