The article Body Pleasure and the Origins of Violence ran in The Bulletin of the Atomic Scientists in 1975. Dig the first sentence:
A neuropsychologist contends that the greatest threat to world peace comes from those nations which have the most depriving environments for their children and which are most repressive of sexual affection and female sexuality.
I suspect I've hooked a lot of my readers right there, but let me add that author James W. Prescott marshalls an astonishing array of anthropolgical studies and other data to say that cuddling with small children and openness about adult sexuality reduce societal violence. Though Prescott slips into a polemical tone in places, this long article is a very compelling read.