But, couldn't you just as easily say, having babies is a side effect of sexual attraction? That we are put here for pleasure primarily, and having babies is a side effect to us taking pleasure in life, so that new people can arrive and take over the pleasure gig once we are pushing up the daisies?
I just think that God, the great design, whatever, when it had the breast on the drawing board, said, ok, this is part baby feeder, part sexual pleasure organ....of equal importance.
I mean, life is difficult, we are always trying to figure it out and whatnot, so we focus on the practicalities of life being the major ones, but maybe one day when we are all living in a utopia of pleasure and peace(or as close to that as we can get), we will see life more as a pleasureable experience, and the practicalities are the side effects.
It is just two ways of looking at things, from opposite angles, so that is why I am saying both functions are of equal importance.