An erect penis is no miracle cure for all sexual problems. Any sexual relationship involves a great number of personal, social, and cultural factors, and some of them may be much more important. Indeed, a woman's perspective on sexual intercourse may be quite different form that of her partner. Each woman's sexual desires and expectations are unique, and on the psychosocial level there is no such thing as a spontaneous, universal, standardized response. A woman may, above all, want emotional involvement, a sense of security and acceptance. Men are often greatly concerned with the build-up and release of pelvic tension, but women may need much more for their sexual satisfaction than mere physical "functioning".