On top of the timing for your ejaculation being fairly quick, you must also be unable to control or delay it at all, and this issue must cause negative psychological consequences. Why we last so long is a pretty complicated question with no clear answer, but a clue may be in the way the penis is shaped. This is the time you should take in bed, experts have revealed Love Honey claims that sex tends to last only 19 minutes for the average couple - 11 minutes short of the ideal. Why do we have sex for so long? This means that if you line up the couples from shortest sex to longest sex, the middle couple goes for an average of 5. Twenty-three per cent of men would prefer the act to last longer, and 15 per cent of women feel the same. As an evolutionary researcher, all this talk of how long sex lasts make me wonder: So what did the researchers find? The average median, technically across all couples, though, was 5. Researchers in from the Kinsey Institute found: What is the mean intravaginal ejaculation latency time? What does the research say? All sex really needs to achieve, it seems, is to put sperm into the vagina. You may note this could affect the mood somewhat, and might perhaps not exactly reflect the natural flow of things. Well, there are two main problems with this.