i am almost baffled by the situation

[picto90]

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i am an atheist .i am the first of my Hindu family who left Hinduism for sake of truth.i was confident that science has the ultimate power to explicate everything but life is so complex to comprehend.still there are certain things which incapacitate science to explain it.
for example if you ponder over the sacredness of kin relations one could gather that it is engraved upon our minds by someone.
the other day my atheist friend argued with me over yahoo that its not divine rather evolution thought us so.
on a point we reached to the subject of incest .he said,"men are wired for sex.they want it constantly and with multiple partners.evolution has produced this.it is natural"
in reply to that i asked him why evolution did not produce willingness for incest.
he replied," we are not wired for incest because breeding with people too genetically close to you increases the chances of recessive genes manifesting and producing a child with a genetic disease "
i asked him," it means one can approach his mother or sister with the condoms ?"
he went offline.
so such things make me sure that things are not so plain and superficial as we take .
" Heard Melodies Are Sweet But Those Unheard Are Sweeter "

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Peoples aversion to incest is a prerequisite condition of evolution. I can see how you could argue that the use of a condom might make it okay, but you have bare in mind that evolution affects the way we think, and doesn't take into account the invention of contraceptives, which are fairly recent, (at least effective ones are anyway). Being that evolution has created that distaste to incest in the way we think, it's understandable to see that cultures too have evolved a bias against it. As rational human beings we can justify that if we use contraceptives then it's okay, but that doesn't change the fact that a lot of us (obviously there are exceptions) are hard-wired to believe it's bad, due in part to evolution and in part to culture. Personally, it disgusts me, but should it? I don't know. I don't know if I'm against it because I should be against it, or if I'm against it because I've been told I should be against it. Nature versus nurture.