Reasons for being single:

Men are single because there's no woman to give his love;women are single because there's no NICE man deserves her love;when a man persist in being single, people would think he just focus on career;when a woman persist in being single, people would think something wrong with her.

Appreciation, admiration:
Appreciation from man inspires charms in woman, admiration from woman strengthens courage in man;
Too much appreciation might turn woman flighty and self-deceived, excessive admiration might make man cocky and arrogant.

Silliness and brightness:
Men could be always acting foolish, but unbelievably intelligent in love;woman could be always quick minded, but unfortunately dum headed in love.

Dilemma:
Men would feel distressed without women, but stressed when with his woman;women would feel upset without men, but annoyed when with her man.

Date:
Men get there earlier to please women, whereas women sometimes get there late on purpose to test men.

Heartbreak:
Men work hard as a revenge, while women take a revenge as work.

Bearings:
Men might stand unloyal love but not accept an unhappy marriage;women might accept an unhappy marriage but not accept unloyal love.

Intimity:
Men go for physical intimity while women want mental intimity more, so men wanna see a nude body while women hope to see an uncovered heart.