Why Is Sex Fun? : The Evolution of Human Sexuality no futrebol ....porque os árbitros preferem raparigas e o resto dos já sinto francês en arriére preferem o cristiano ronaldo e o RAPe by justinho bieber de de envido chouriça de grande calibre...o livro responde a esta e muitas outras questões ...The Evolution of Human Mating David M. Buss University of Texas, Austin Mating is close to the engine of the evolutionary process—differential reproductive success. As descendants of reproductively successful ancestors, modern humans have inherited the mating strategies that led to our ancestor’s success. These strategies include long-term committed mating (e.g., marriage), short-term mating (e.g., a brief sexual encounter), extra-pair mating (e.g., infidelity), mate poaching (luring another person’s mate), and mate guarding (effort devoted to keeping a mate). Since men and women historically confronted different adaptive problems in the mating domain, the sexes differ profoundly in evolved psychology of mating solutions. These psychological sex differences include possessing distinct mate preferences, dissimilar desires for short-term mating, and distinct triggers that evoke sexual jealou sy. This article reviews em pirical evidence supporting evolution-based hypotheses about these mating strategies. The study of human mating is one of the true “success stories” of evolutionary psychology. Keywords: mating, adaptive problems, sexual jealousy, evolutionary psychology. 人类“性交往”的进化....há que dar espaço à literatur mais amarelada...关键词： 性交往，适应性问题，性嫉妒，进化心理学。 分类号： B84-069 Mating is close to the heart of the evolutionary process responsible for creating adaptations—the differential reproductive success of individuals as a consequence of heritable differences in corresponding traits. Simply put, those who fail to mate fail to become ancestors. If any one of our ancestors failed to select an appropriate mate, failed to successfully attract a mate, or failed to retain a mate for enough time needed for reproduction, we would not be here to contemplate the successful strategies that led to our existence. Modern humans are all descendants of a long and unbroken line of ancestors who succeeded in the complex tasks required to mate successfully. As their descendants, modern humans have inherited the mating strategies that led to their success. Successful mating requires solutions of a number of difficult adaptive problems. These include selecting a fertile mate, out-competing same-sex rivals in attracting a mate, fending off mate poachers Já sinto França ....Nowhere do people have an equal desire to mate with all people. Everywhere, some people are preferred as mates, others shunned. Desires are central to all facets of mating. Desires determine who we are attracted to, and who is attracted to us. They influence which attraction tactics will be successful (those that fulfill desires) and which attraction tactics will fail (those that violate desires). Successful mate retention tactics involve continuing to provide the reproductively-relevant resources of cu adopção...Why are humans one of the few species to have sex in private? Why are human females the only mammals to go through menopause? Why is the human penis so unnecessarily large? There is no more knowledgeable authority than the award-winning author of The Third Chimpanzee speculates the answers to the more rare and suspicious aspects of human sexuality: our tendency towards monogamy; recreational sex in general; concealed ovulation; menopause; men's attraction to big boobs, big butts...and big penises; and the use-ful/less-ness of men in general

The Evolution of Human Sexuality is a 1979 book 
Symons surveys human sexual behavior and discusses human sexual evolution, including the development of human ovulation. He argues that in all societies, sex is typically conceived of as a female service or favor. In his analysis of homosexual behavior, Symons concludes that the reason gay men have on average more sexual partners than straight men, and many more than straight women, is that gay men do not have to compromise with the different sexual tastes and inclinations of women. Gay men's sexual behavior is an exaggerated version of universal male tendencies, while lesbian women's sexual behavior is an exaggerated version of universal female tendencies. Symons suggests that straight men would have as many sexual partners as gay men if they had the opportunity.
Discussing rape by RAP, Symons criticizes Susan Brownmiller's Against Our Will (1975) and her argument that rape is not sexually motivated.  
Why do we have sex even when there is no chance of pregnancy? This needs answering because most of the other mammals in the world would look at us as incredibly strange for engaging in such odd behaviour.

Why don’t men breastfeed? We have most of the equipment and men have been known to produce milk – even without scientific intervention. So, why not?

I’m only going to answer one of his questions – he asks, what are men good for? And his answer? Not a lot. Men come out of this book looking rather pathetic. We don’t do nearly as much helping out as women do, we don’t do hardly anything at all except some occasional hunting and ‘alpha’ posing. It is quite unattractive – and that does seem to conform to my understanding of what most men seem to be like.

There are lots of other questions in the book, why menopause? Why are women pretty? Why do women have large breasts? And the most surprising ‘answer’ in the book is to the question, why do men have such large penises?

The best thing about this book is that it shows that many of these questions have not been completely settled. The questions are clearly important, they are all very easy to ask, but the answers many not be nearly so easy to come by. Diamond presents some of the alternatives here and this makes for a fantastic insight into the scientific method, particularly as it applies to the evolution of various traits and behaviours

The Evolution of Human Sexuality was called "the best single book on the sociobiology of sex" by law professor  "the first comprehensive anthropological survey of human sexual behavior from the new Darwinian perspective" and a "classic but controversial treatise on human sexual evolution" by biologist Ehrlich also identifies Symons' study of the development of human ovulation as a landmark.

Why Is Sex Fun?: The Evolution of Human Sexuality (Science Masters) - Jared Diamond

This book speculates on the evolutionary forces that shaped the unique aspects of human sexuality: female menopause, males' role in society, having sex in private, and--most unusual of all--having sex for fun instead of for procreation. Through comparative evolution, biologist and science author Diamond (Guns, Germs, and Steel: The Fate of Human Societies), poses credible and thought-provoking yet entertaining factors: the lengthy period of dependency of human infants, sex for pleasure as the tie that helps bind a mother and a father together, and menopause as an evolutionary advantage that, by ending the childbearing years, allows females to pass wisdom and knowledge on to society and succeeding generations.
 Human lactation is energetically very expensive," and nursing mothers eat like men?

This is hardly the same as eating like an active man: "Studies have shown that most healthy breastfeeding women maintain an abundant milk supply while taking in 1800-2200 (or more) calories per day." "Breastfeeding your baby, on average, burns 200-500 calories per day" - kellymom.com

He claims lactational amenorrhea lasts for up to several years, so mothers in hunter/gatherer societies would only have children once every few years. What? Moms practicing ecological breastfeeding - breastfeeding on demand, cosleeping and nursing throughout the night, using no artificial nipples (bottles/pacis), i.e. similar to what the hunter/gatherer society model would be - average about 14.4 months of amenorrhea. In my >10 years experience of working with nursing dyads, 18-24 is about the longest I have heard claimed with any regularity, and even those moms are outliers.

He says that hunter/gatherer mothers were able to enjoy such long periods of amenorrhea because they nursed "many times each hour," whereas modern mothers nurse "only every few hours" for convenience. I am honestly not sure if Diamond's own children were only nursed for the first few months of life, or if they followed the Ezzo plan, or what. Even today, newborns nurse all the time, and breastfeeding is not about what's convenient for the mother, but about when the baby needs to eat. Mothers who refuse to nurse more often than every 3-4 hours are likely to find that their nursing relationships don't last much beyond the switch to autocrine control, between 3-5 months. Yes, there are women who, by biological happenstance, do have higher storage capacities and can get away with less frequent emptying of the breast, but babies are babies; they have growth spurts, they teethe, they don't know how to read clocks.