I see people associating mother nature, purity, impurity to sex :)
Wow thats cool, be practical guys,
Food, Water, Sex & Mind is given to us by Mother Nature.
Religion decided to say this food you should eat this food you shouldnt.
Luckily water is allowed by everyone.
Intellect in order to avoid competition and fights between people vieing for the same girl or guy, ended up making rules called Marriage :)
Mind, its controlled by group phobia. What would people think and they react accordingly. How many of you can deny that if your deepest thoughts in your privacy have never crossed the borders of the so called right and wrong?
As long as you do not cause harm to others and respect their privacy, you should do all the things that you can that you feel you want to.
Its all mind games people play to find a meaning to live in this world...