Actually, I saw a program on I think it was the Discovery Channel that said that orgasm might possibly aid women in conception. I don't know exactly how true that is...but these doctors had placed a tiny camera inside a woman's uterus (I think, it's been a while since I saw it). And apparently when she reached orgasm, her cervix kinda dipped down into the pool created by the man's ejaculate and created a suction, helping it to reach it's goal. Like I said, I saw it on TV, and I have no idea how true that is, but I felt like sharing anyway!
------------------ "You have to walk carefully in the beginning of love; the running across fields into your lover's arms can only come later when you're sure they won't laugh if you trip." ~Jonathan Carroll
The trouble is that it sounds like the assumption you're making is that all sexuality and sensuality must be realted in some way to reproduction, and that there must have been some grand human design that has us all engineered for certain purposes. And that approach is only one of many.
In the most basic sense, our entire bodies are like lightning rods for stimulus from the senses, and recptivity to sexual stimulus is really just one more of those. And we certainly aren't the only species to be that way: species which do survive are highly sensitive and recptive in general.
if it all had to do with reproduction, we'd have a lot more questions than just this one, like: why do anuses have so many nerve endings which provide sexual stimulus? Why does kissing bring us sexual pleasure? Why do people pair-bond?
There's no real answer to your question, because no one has the blueprint for human evolution or design. Any answer to that would be sheerly theory, and it could be all over the map. We may find sexual pleasure in things that aren't reproductive expressly to CURB reproduction, for instance. On the other hand, orgasm and sexual arousal also produces more vaginal lubrication which is conducive to conception, and sexual pleasure does compel people to want to sexually pair.
we talked about this a bit last year in my biology class. i *think* one of the theories is that since women and men evolved commonly, the female sexual response and the male sexual response are similar in many ways. for instance, clitoral tissue is the same as penile tissue, except that the urethra runs through the penis.
also, this has to do maybe with the way men and women differentiate in development. in the womb, i believe the fetuses are essentially the same in terms of reproductive organs, until in the case of a baby boy, his brain begins to release testosterone, triggering the development of a penis and testes. so basically, the same nerves are there, but the orgasm serves a clear reproductive purpose <most often through ejaculation> whereas this purpose is not so clear for women. maybe. i'm sure there's someone who knows more about this than me around.
As KittenGoddess said, I saw the same thing on the discovery channel. They found that when a woman has a g-spot orgasm, apparently their pain recepters are almost completely numbed... Making giving birth not as painful as it would be. (And **** , from what I've heard it's still pretty damn painful anyways!)
One thing I know is that sex is a very potent way of physically bonding with someone... And that perhaps the orgasm contributes to this bonding process?
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