An orgasm is a moment of intense pleasure that is the culmination of sex. People really enjoy orgasms.
A man or a woman gets an orgasm during sex, and it doesn't really matter what kind of sex. Even solo sex — masturbation — produces orgasms. People like orgasms so much that when they enjoy something else — like good music — they sometimes say they had an eargasm. A great movie could bring a fangasm. A vulgar, slang way of saying someone is orgasming is to say they're coming or cumming.