The words 'libido' and 'sexual desire' reflect the much more muted sensations that women report. Women are generally offended by men's crude sexual urges that are expressed in erotic terms. Women prefer to talk of lovemaking. But how can an act that is designed to impregnate a woman also cause her orgasm. It is a contradiction. Without reliable contraception, no woman in her right mind volunteers for unprotected intercourse unless she wants a baby. Women make a conscious choice to allow a man to thrust into their vagina. Emotional attachment may help persuade them.