Only later did the term come to mean ejaculation that occurred earlier than desired. In the ’80s and ’90s, sexologists tried to define premature nut-busting according to number of thrusts - generally, eight to 15 - but have since switched to minutes. What’s changed? The sexual revolution, for starters, which made female sexual pleasure a public goal for men for the first time. In 1970, Masters and Johnson boldly defined all heterosexual men who came before their partners more than 50 percent of the time premature ejaculators. Modern doctors tend to be less doctrinaire about who must orgasm when, but they do agree on some rules of thumb. According to a 2008 survey of sex therapists, sex is “too short” when it lasts one to two minutes. “Adequate” is three to seven minutes, and “desirable” is seven to 13. The range for “too long” went up to 30 minutes. Gay men cumming while making love videos how to#.