1 Marvin Gaye breaks it down in “Let’s tumble On”—what may be simpler? Psychologists at the University of Texas at Austin take a unique read. They surveyed 444 folks [pdf] and located 237 reasons why folks copulate. 2 “I was drunk” created the highest fifty for women; “to get a favor” created the highest fifty for men. 3 Believe it or not, biologists cannot agree on the rationale for sex either. 4 the quality biological process argument is that the blending of deoxyribonucleic acid between 2 members of a species introduces additional variation into the sequence pool. however agamogenesis is way additional economical. 5 One leading hypothesis suggests that sex won out over DIY as a defense against parasites, which might be less harmful during a varied sequence pool. 6 In 2009 a team of scientists bolstered this concept by observation 2 teams of snails—one that reproduced sexually, the opposite asexually. Over time, the self-starters became additional prone to parasites, dying off at a quicker rate. 7 Not that reproduction is strictly malady free. About 3.7 million Americans carry the foremost common sexually transmitted parasite, Trichomonas vaginalis. 8 you're thinking that we’ve got troubles? The sexual activity decision of bound Hawaiian male crickets attracts a fly that deposits parasitic larvae. once the larvae mature, they burst out of the cricket, killing it instantly. 9 Some male crickets have a mutation that forestalls them from creating the decision, serving to them elude the deadly flies. The sneaky-quiet ones hang around round the vulnerable singing crickets so that they will still meet women. 10 one amongst nature’s most elaborate sexual activity rituals belongs to the nursery internet spider. Males wrap a group of gifts—typically edible insects—in silk bundles and gift them to potential mates. 11 In some cases, male spiders attempt to sneak in chaffy things just like the leftovers of already-eaten bugs, therefore females have learned to look at the gift. Danish researchers found that so much larger success was awarded to males UN agency had a nicely wrapped package. 12 once the mood strikes a male Cairina moschata, the corkscrew-shaped embodiment of its excitement shoots to a completely extended 8-plus inches in barely zero.36 second. 13 Battle of the sexes: The corresponding feminine organ is additionally corkscrewed—but within the wrong way. 14 Studies of human male inflation, a.k.a. “phallometry,” typically use a sealed, gas-filled cylindrical chamber that matches snugly round the object of interest and registers the quantity of gas displaced. 15 Equivalent studies in ladies use a photo-plethysmograph, a research that measures pulse and changes in blood volume within the canal. 16 man of science Meredith Chivers of Queens University in Ontario, Canada, used similar devices to check objectively however men and ladies felt sexy films. Heterosexual men, additionally as homosexual men and ladies, became aroused whereas viewing engaging members of their most well-liked sex engaged in agamous activities, like walking on a beach. For heterosexual ladies, a unadorned strolling guy didn’t do a lot of. 17 nonetheless Chivers found that ladies exhibited inflated blood flow once observance bonobos mate, albeit they failed to report feeling aroused. 18 Chivers speculates that inflated blood flow (and associated lubrication) in response to witnessed sexual behavior may be a biological response that prepares females for explosive, unsought penetration. 19 Ohio State University man of science Terri Fisher tested the oft-repeated claim that men consider sex each seven seconds (which interprets to eight,000 instances daily) by having 283 students carry around a golf-score counter and click on when they thought of sex, food, or sleep. In reality, the young men’s fancy turned to sex simply nineteen times per day. 20 The young ladies within the study had ten such daily thoughts, on average, and each genders thought of food and sleep even as typically as sex. Sex
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