"Giles published his "naked love theory" of human hairlessness in 2010. He postulated that hairlessness in humans evolved as a result of the pleasure of skin-to-skin contact between mother and child, and thus ultimately as a consequence of bipedalism. According to Giles, naked skin is a precondition for the appearance of romantic love."
"‘The Naked Love Theory’ also helps to explain the evolutionary origins of romantic love. ‘One thing that distinguishes us from our closest primate relative is the intensity and duration of sexual intercourse,’ he says. ‘While sexual intercourse for chimpanzees typically lasts about seven seconds, with human beings it’s more like 10 minutes.’ One of the reasons for this, argues Dr Giles—who is also the author of ‘The Nature of Sexual Desire’—is the extensive caressing of naked skin that human beings typically enjoy in sexual intercourse due to our lack of fur. This provided the pre-condition for the extensive long-term romantic attachments that human beings are capable of. Although some other primates have long term attachments, our closest relatives tend not to have them or form only short-term consortships. ‘Numerous biological features were, of course, prerequisite for the emergence of romantic love, but without human nakedness and all that it entails for skin-to-skin contact, it is doubtful that romantic love as we know it would have ever appeared,’ he says."
