Anything for You: Love, Sex and Science
Finally, one size does not fit all.
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Whereas being in a happy relationship may bring certain advantages, being in a dysfunctional one is unlikely to do so. So lip colour might just be a consequence of the thinner skin there, which improves sensitivity. Spacecraft are too cramped and too public to keep any unauthorised zero-g shenanigans secret, and being caught would almost certainly guarantee that the participants would never go into space again.
Officially sanctioned research has begun into two-person sleeping bags that might allow weightless sex, but so far nobody has actually tested them. It seems to have evolved independently nine times in different mammal lineages but it has also subsequently been lost in many cases. Among primates, humans are the only ones without a baculum, although it is tiny in gorillas and chimpanzees. The baculum allows prolonged penetration and it is normally only present in animals that mate for longer than three minutes.
Humans evolved monogamy as a reproductive strategy, which — along with other social rules — reduces the risk of females mating with rival males. Men can therefore get away with shorter copulation times. Geese form lifelong couples and virtually never mate with anyone except their partner. There are three main explanations for why social monogamy evolved in humans, and biologists are still arguing which is the most important.
It may be because human babies need a lot of looking after and stable couples can share the parenting burden. Or it could be because men want to stay close to prevent their partners from cheating.
And it could also be a strategy that women evolved to discourage men from killing infants that they suspected were not theirs. Monogamy in humans is beneficial because it increases the chances of raising offspring, but it is actually very rare in mammals — less than 10 per cent of mammal species are monogamous, compared with 90 per cent of bird species. Even in primates, where it is more common, only about a quarter of species are monogamous.
Men tend to seek more short-term relationships and look for physical attractiveness. There are trade-offs between looks and health, and the desire to find someone similar in education, religion, intelligence, and wanting a family. Few people are aware of these underlying reasons, yet the same effects have been measured in 37 cultures across six continents.
As for sexual orientation, many genetic, hormonal and other effects contribute to people finding others of their own sex more attractive. Pigeons touch beaks, cats and dogs nuzzle each other, male fruit flies lick the females. At the most basic level, kissing is just a way of tasting and touching a potential mate, as part of the process of assessing suitability.
In primates though, kissing might also be a behaviour that has transferred from maternal feeding. We depend for our first meals on our ability to suckle, and the positive feedback mechanisms that evolved to encourage infants to do this last into adulthood.
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Kissing triggers lots of hormone changes, including raising oxytocin levels — the hormone that creates a sense of attachment. All female mammals have a clitoris, the sole purpose of which is to react to sexual stimulation, and presumably this stimulation has evolved to be pleasurable for most species. But establishing whether sexual pleasure ever actually tips over into orgasm is hard. Female chimps, macaque monkeys and cows have all been stimulated in the lab to the point of experiencing vaginal and uterine contractions, which does suggest that other female animals are at least capable of orgasm.
Whether they regularly have them during normal copulation is much less certain; most animal sex is very brief and often quite violent. Beyond mammals, the case for a female orgasm is more tenuous.
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Most other vertebrates use external fertilisation; the female deposits her eggs and the male squirts them with sperm. There are exceptions, though. Most dog breeds go into heat twice a year and many rodents reproduce almost continuously through the year. In some primates, social factors are more important than food availability. This is thought to reduce the rate of infanticide from unrelated males, by making it hard for them to be sure whether or not they are the father of any offspring and this may have been important in humans too. Human sexual behaviour does vary subtly throughout the menstrual cycle, though.
A study at the University of New Mexico found that lap dancers earned more money when they were fertile; perhaps because they were unconsciously acting sexier. Studies with identical twins have shown some evidence for an inherited component to homosexuality. For example, a study at the University of Toronto showed that each older brother a man has increases his chance of being homosexual.
The inherited component of homosexuality seems to be much weaker in women than men but culture, lifestyle and early sexual experiences are probably more significant than genetics for both genders.
Scientists reveal the key to having more SEX with your partner - Mirror Online
Certainly, upbringing and culture have a big impact on the way that people acknowledge and define their own sexuality. It may flourish when the Sun shines. When the Sun was shining, 22 per cent of the women gave out their phone numbers, compared with 14 per cent on cloudy days. Bright sunshine lowers levels of melatonin the sleep hormone and increases levels of serotonin in the brain, leading to a better mood. So probably both the men and women felt more cheerful and more inclined to take a chance. The temperature was about the same on the different days so it was likely the sun, not the heat, that did the trick.
Kissing can also make us feel vulnerable or self-conscious and closing your eyes is a way of making yourself more relaxed. Really, really want? The cost of reproduction is much lower for a man than a woman. Other Editions 1.
Opening the lines of communication between research scientists and the wider community
Friend Reviews. To see what your friends thought of this book, please sign up. Lists with This Book. This book is not yet featured on Listopia. Community Reviews. Showing Rating details. More filters. Sort order. Jun 02, Avery De Witt rated it liked it Shelves: , non-fiction. A bit of repetition here and there, but overall it was pretty alright.
Nov 12, Nora rated it really liked it. A highly informative read, this Goodreads Giveaway is packed with such scientific detail you wouldn't know where to begin. It was a bit upsetting that aside from several mentions of same sex relationships and polyamory, most of the relationship examples and used pronouns were stereotypical hetero monogamous ones. Another curiosity of mine: is it just me or is asexuality not mentioned enough? It would have been interesting to read about asexuality, and if people who identify as that experience mo A highly informative read, this Goodreads Giveaway is packed with such scientific detail you wouldn't know where to begin.
It would have been interesting to read about asexuality, and if people who identify as that experience more romantic brain activity than most.
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Also very color backlash is the tiny blip of BDSM, in the same minority group as asexuality and same sex relationships in this little book. Really interesting topic, just wish they could've included a more diverse approach of proper explanation using examples of different relationship dynamics; use the sources provided to your advantage in learning more!
This is one tiny book that packs a lot of punch. Nov 04, Sandra Simmons rated it it was amazing. Very interesting. I was amazed at how much I did not know. Totally worth a read even if your married. I saw this book first on the Good Reads giveaways and was happy to pay for it. I am sharing with a friend already! James Athey rated it liked it Oct 04, Molly rated it really liked it Aug 07, Frank rated it liked it Jan 07, John rated it really liked it Jan 08, Kate Woods Walker rated it liked it Apr 06, Joseph Rivers rated it liked it Nov 14, Christine rated it liked it Jun 08, Chandar Gamble rated it it was amazing Feb 10, David Stojka rated it really liked it May 26, Bill rated it really liked it Feb 09, J marked it as to-read Nov 18, Chimichurri marked it as to-read Jul 14, Mildred is currently reading it Apr 02, Bernadett D Brown is currently reading it Aug 09, Frederick Rotzien marked it as to-read Nov 04, Dan marked it as to-read Nov 04, Brandy marked it as to-read Nov 04, Dana marked it as to-read Nov 04, Dawn marked it as to-read Nov 04, Katie Harder-schauer marked it as to-read Nov 04, Vykki marked it as to-read Nov 04, Jennifer marked it as to-read Nov 04,