There's several things that can turn a man off: Sexually aggressive women is a top earner. Bad past experience with women can work wonders on a man's libido. Bad mother/son relations is another top killer. Adultery. Bad health. Ugly spouse. Or perhaps a female partner who is loose or one who is too ignorant to buy some ben wa balls. Mental problems. Emotional problems. Chronic depression. Self-conscious about his penis. A lack of self esteem. Maybe he's a mental fag; always thinking homosexual thoughts. The list goes on and on. If you're an American woman, that may be the problem in and of itself.