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| quote: | Originally posted by Nrg2Nfinit
Is that advantageous though? Evolution states that the traits that are best suited for the environment are amplified. You have a point and i understand that. Humans purpose in life these days isnt simply to reproduce, thus behaviour and adaptation isn't critical for reproduction. So in this case natural selection doesn't work for humans in the case of reproduction. And how could genes for homosexuality be amplified if a homosexual cannot reproduce? So in this case the only acceptable mutation would be a hox gene mutation which could easily be spotted. It hasn't so a genetic factor cannot be correlated.
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It can still be a gene or genetic expression that is turned on or off more easily than other genes or genetic expressions. But yeah good point...if someone is gay then why aren't their offspring more likely to be gay? If one twin is gay the other is most likely to be gay too. What does that tell you?
Homosexuality on an evolutionary perspective is not advantageous at all. Neither is near-sightedness. However both cases do not matter in further progressing the human species now because we have developed a culture to adapt for this loss (i.e. contacts, laser surgery, ...and adoptiong, artificial insemination...too much population anyway).
| quote: | | The purpose of sex is to reproduce plain and simple. Anything taken out of that context is learned behaviour. To have sex with 3 women at a time may be just as appealing to one as having sex with 2 people of the same gendre to another. That comes down to learned behaviour and preference. Im sure if you wanted to have sex with a woman, you could get it up and do it. It would be the same with me and a man, im sure id be able to give it to a guy anally, but i chose not to. You may be more inclined towards this beahviour though. This explains bisexual behaviour. Most gays are typically bisexual and have had encouters with both sexes. |
If you look at the inside of the shape of the anus, it matches that of an erect penis perfectly. Maybe humans males in the past have evolved to "practice" on each other before tapping the female. Therefore we should all just be bisexual. I got hit on by a hot blonde chick from Vancouver last night. =)
| quote: | | Its a tough subject to deal with but judging by animal history, the genes do not have a cahnce to get amiplified since a man cannot reproduce witha man and a woman cannot reproduce with a woman. The only way this can occur is through people who are bisexual. So bisexuals continue to reproduce and you may have mutation that would code for pure homosexuality that could only last for one generation. In this case a genetic analysis that compares with the parents could demonstrate a difference. |
Don't forget gays can still produce, but their offspring are not more likely to be gay than straight people's offspring. So this rules out a "pure genetic" factor and shows there is nurture involved at some point.
| quote: | | it can also be factors in the whomb, i didnt count that out. Im just simply saying that a genetic factor is highly implausible. |
I disagree with you in that genetic factor is plausible, but it is implausible without nurture, whether it be pre-natal, hormonal influences, chemicals that change gene expression, or something else.
Asking this question again: are there such things are boy/girl identical twins?
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