Why is ity not mental and psychological?

Phew! I can't answer everything you have in here--but as a Guidance and Counselor with very troubled adolescents for 20 yrs, and from studying the literature, etc., I'm convinced that our uality is predetermined by the hormonal balance of the birth-mother's. If their testosterone level is high.....low....etc. I disagree totally re your statement that "the drive is mental...". Survival of the human species would have been in dire trouble, if so.