HOME SEX COMMON XVIDEO FACEBOOK YOUTUBE INSTAGRAM QUORA REDDIT FLICKER ************************* Is there any need for sex to last long? As an evolutionary researcher, all this talk of how long sex lasts make me wonder: Why does it last any time at all? All sex really needs to achieve, it seems, is to put sperm into the vagina. Why all the thrusting and bumping? Instead of sliding the penis in and out many hundreds of times per sexual session, why not just put it in once, ejaculate, and then go have a lemonade and get on with the rest of the day? Despite the ‘in-out’ being fun, does it serve a purpose biologically? Before you say, Because it’s fun to go in and out!, remember evolution doesn’t care about fun per se – it generally only “designs” things to be enjoyable if they helped our ancestors pass on their genes to future generations. For example, even though we like eating food, we don’t chew each mouthful of it for five minutes just to make the enjoyment last longer. That woul...