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Solved: why we like sex so much

 
 
ehBeth
 
Reply Sat 2 Apr, 2005 09:09 am
http://www.thisislondon.co.uk/londoncuts/articles/17612302?source=Metro

Quote:
It's an enjoyable way to create babies, and normally a sure-fire way for couples to make up after a blazing row.

But is sex really worth all the effort and hassle involved?

In a bid to solve this riddle, scientists set about experimenting - with yeast.

They used two strains, only one of which was able to reproduce sexually.

Normally yeast cells are asexual but, by putting them under stress, the researchers forced male and female spores to develop.


<snip>

Quote:
Over 300 generations, the growth rate of the sexually reproducing yeast rose by 94 per cent compared with only 80 per cent for the asexual yeast.

The study, by a team from Auckland University, seems to back a theory by 19thcentury biologist August Weismann, who said sex enabled species to evolve faster.


Science is goooooood Cool

Lotsa coverage on this (this may be a tough piece of science for the counter-evolutionists to appreciate)

link

Quote:
Why do we have sex?

It's a dumb question for most people, perhaps, but a frustratingly difficult one for evolutionary biologists. After all, sex is a time-consuming, exhausting and genetically risky affair, and yet most animals and plants, from dogs to dogwoods, do it.

Thanks to the sex lives of yeast cells -- or lack thereof -- scientists may have a better answer for why sexual reproduction arrived so early in our evolutionary past and pays off so handsomely in the long run.

Yeast cells that engage in sexual reproduction, a new study suggests, boost their genetic variation and adapt better to harsh conditions than those consigned to an asexual existence.

In an e-mail, study co-author Matthew Goddard from the University of Auckland in New Zealand said the research "tackles one of the oldest theories concerning the maintenance of sex" and shows that sexual populations can adapt more rapidly than asexual ones.

By definition, sexual reproduction delivers re-shuffled genetic material from parents to their children. Virtually all animals must have sex to reproduce, but some organisms such as microbes, fungi and yeast often have a choice, depending on the circumstances.

Researchers in the late 19th century suspected that sexual reproduction won out over asexual reproduction early on and now dominates in the animal world because it allows for faster adaptation in a pinch.

But no one could prove it.

In today's issue of the journal Nature, Goddard and colleagues provide a new boost to the old idea by taking advantage of a quirk in yeast reproduction: Well-fed yeast cells are content to reproduce asexually. But if starved, they have sex instead, yielding four spores that are functionally equivalent to two sperm and two eggs. The spores pair, fuse and produce the next generation of yeast.


Published by Nature, this is serious stuff.
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Bi-Polar Bear
 
  1  
Reply Sat 2 Apr, 2005 09:16 am
and here all this time I thought people liked it because it felt tasted and smelled fabulous and because orgasms rule.

Of course I'm no rocket surgeon.
0 Replies
 
sozobe
 
  1  
Reply Sat 2 Apr, 2005 09:21 am
Yer not thinkin' like a scientist, blue. WHY does it feel and taste and smell fabulous?

Interesting article, thanks!
0 Replies
 
ehBeth
 
  1  
Reply Sat 2 Apr, 2005 09:21 am
You're just the pilot, right.



Cool
0 Replies
 
Bi-Polar Bear
 
  1  
Reply Sat 2 Apr, 2005 09:23 am
ehBeth wrote:
You're just the pilot, right.



Cool


Yes indeed. And there's nothing Ilike better than a plush cabin with two cockpits. :wink:
0 Replies
 
msolga
 
  1  
Reply Sat 2 Apr, 2005 09:24 am
And all this time I thought it had something to do with True Lurve? Confused
0 Replies
 
Bi-Polar Bear
 
  1  
Reply Sat 2 Apr, 2005 09:24 am
sozobe wrote:
Yer not thinkin' like a scientist, blue. WHY does it feel and taste and smell fabulous?

Interesting article, thanks!


Because if it didn't feel taste and smell fabulous no one would do it and that whole be fruitful and multiply thing would be in the crapper?

What do you think the world populaton would be if orgasms were painful?
0 Replies
 
Bi-Polar Bear
 
  1  
Reply Sat 2 Apr, 2005 09:25 am
msolga wrote:
And all this time I thought it had something to do with True Lurve? Confused


Well, I truly love sex. So you might be on to something. Very Happy
0 Replies
 
bobsmythhawk
 
  1  
Reply Sat 2 Apr, 2005 09:26 am
As regards homo sapiens health studies reveal many benefits to sex.

The Health Benefits of Sex

Learn how Sex can actually be healthy for the body and mind.

by Susie Cortright, author, Rekindling Your Romance After Kids

October 1, 2003

Quick quiz: Would you rather run 75 miles or have sex three times per week for a year? Research shows that both activities burn the same number of calories. (7,500, to be exact.)

We often think that something that feels good can't possibly be good for us. Now it's time to think again.

Sex in a loving, intimate relationship has numerous health benefits. In women, for example, the sexual act triggers the release of oxytocin. Oxytocin promotes feelings of affection and triggers that nurturing instinct. In men, sex encourages the flow of testosterone, which strengthens bones and muscles and helps transport DHEA, a hormone that may be important in the function of the body's immune system.

Paul Pearsall, Ph.D., author of Superimmunity, also maintains that sex in a loving relationship helps the immune system by increasing the flow of certain chemicals in the body.

Hugh O'Neill, editor of Men's Health magazine, recently listed some health benefits of sex, as well. Regular sex is regular exercise and has similar benefits, including improved cholesterol levels and increased circulation. Men's Health also reported that men who have sex at least three times each week may have a decreased risk of developing prostate problems.

Sex, like exercise, releases endorphins. Endorphins contribute to the runner's high and diminishes pain levels.

An active sex life may help us live longer, too. Dr. David Weeks, a clinical neuropsychologist at Scotland's Royal Edinburgh Hospital, conducted a study of 3,500 people ranging in age from 18 to 102. Weeks concluded that sex actually slows the aging process.

Sexual therapists remind us that frequent sex is a form of exercise. And feeling secure in a relationship leads to feeling happier, which could lead to greater health--and a younger look.

In fact, these studies indicate that intimacy plays a key role in the health benefits of sex. A promiscuous sexual relationship may actually produce an opposite effect by introducing a sense of anxiety and fear.

In spite of all these health benefits and the sheer pleasure of the act, Americans may still need a boost. At least one-third of American couples report "inhibited sexual desire," according to The Masters and Johnson Institute.

Sex therapists say sex acts on the principal of "use it or lose it." So, for your heart, mind, and soul, the best advice may be to "Just do it!"

Copyright 2003 Susie Cortright

http://www.lisajohnson.com/health/sex/benefits/benefits.htm
0 Replies
 
sozobe
 
  1  
Reply Sat 2 Apr, 2005 09:26 am
Exactly, blue.

It feels and tastes and smells fabulous BECAUSE it's so important and BECAUSE we're supposed to do it all the time, evolutionarily speaking.

If it wasn't important or was bad, it wouldn't feel and taste and smell fabulous.

msolga, nahhhhhh. True lurvvve is another construct designed to get the species propogatin'.
0 Replies
 
au1929
 
  1  
Reply Sat 2 Apr, 2005 09:27 am
Natures way of saying go forth and multiply. .
0 Replies
 
Bi-Polar Bear
 
  1  
Reply Sat 2 Apr, 2005 09:29 am
So sozobe maybe I have rocket surgeon potential. Wow, do ya think? Nah.
0 Replies
 
sozobe
 
  1  
Reply Sat 2 Apr, 2005 09:30 am
Does a... hmm, pope/ woods jokes seem inappropriate just now.
0 Replies
 
ehBeth
 
  1  
Reply Sat 2 Apr, 2005 09:31 am
Gosh, ain't science grand.



<why don't they ever say it like that in the movies?>
0 Replies
 
nimh
 
  1  
Reply Sat 2 Apr, 2005 09:35 am
i thought they made sex feel so good in order to make you not notice that orgasm is the only moment you can see the other gender for what they really are: aliens from another planet.

(homosexuals are people who wouldnt be fooled and did see the bulging eyes, neon-blue bones and globby tentacles. you cant go back after that.)
0 Replies
 
CalamityJane
 
  1  
Reply Sat 2 Apr, 2005 09:47 am
I don't really need a scientific explanation,
I knew it all along that sex is essential in our lifes Wink
0 Replies
 
dlowan
 
  1  
Reply Mon 4 Apr, 2005 10:05 pm
It is exercise that you can do without getting out of bed.

What's not to like?
0 Replies
 
ehBeth
 
  1  
Reply Tue 5 Apr, 2005 10:51 am
and it helps with evolution

can't really get much better

fun AND useful
0 Replies
 
Ray
 
  1  
Reply Thu 7 Apr, 2005 12:54 am
I thought it was pretty obvious that it's an evolutionary trick so that people would want to reproduce.
0 Replies
 
dlowan
 
  1  
Reply Thu 7 Apr, 2005 02:35 am
I like sex - but I have no intention of reproducing.
0 Replies
 
 

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