You only have to review the ridiculous religious formation of the pre-VII era to understand how EVERY normal, human sexual impulse, or even childhood curiosity about sex was distorted and demonized.  Teaching a second-grader that an "impure thought" meant a trip to the confessional or that teens making out were on the road to hell (while many of those same moralists were among the many child sexual abusers) was the height of both ignorance of the human condition as well as sinful hypocrisy.  Don't kid yourself about a supposed absence of sex-related behaviors then, either -- they were just not publicized or discussed as much.  Sex is a primal instinct FROM GOD and not intrinsically evil as your posts imply.