young i think that has got to do with how soceity evovled over time. i really don't wan to diverge like before tara just for the sake of example, hindisum worships the female creation. all the most powerful and respectable qualiteis are attributed to godesses such as durga, kali, saraswoti, laxmi...so on and so forth and see how our country treats women like second class citizens. education of women is still not prevalent idea and in all sectors of soceity, women are misrespresented. my point being what we practise in society does no reflect what our religion teaches us. when people started settling down, perhaps they had to make rules that would best serve their self interest. so making sex a taboo was probably the best way to ensure that men and women do not become corrupt and filled with lust etc etc. just my hypothesis. i am no expert.