There are three types of bonding between a man and a woman–sexual attraction, romantic bonding, and platonic bonding–and all contribute to the strength of a relationship.
Sexual attraction: Sexual attraction is different between men and women. Men’s sexual attraction is primarily fueled by a woman’s beauty, youth, and femininity. Other things can have a significant effect if the sexual attractiveness rating of a partner is close to the minimum threshold. Women’s attraction is affected by a man’s confidence, status, social awareness, jerkiness/thuggishness (is he dangerous?), looks, and evaluation of him by other women (female herd opinion = preselection).
Romantic bonding: Oxytocin promotes romantic bonding. You get this from sexing up your partner and looking at his/her face periodically. Or from lead/follow dancing. This won’t replace sexually attractive bonding, but it can affect it significantly. Duty sex promotes romantic bonding. Too much of a need for it indicates a major relationship problem.
Platonic bonding: Sweetness promotes platonically bonding a man to a woman. Thoughtfulness promotes platonically bonding a woman to a man. Platonic bonding will not replace sexual attraction, of course, but it can affect it enough to reduce/raise sexual attraction above a minimum threshold. Bitchiness will always negatively affect a woman’s sexual attractiveness. Paradoxically, jerkiness will often raise a man’s sexual attractiveness. So, a man who is too thoughtful and not jerky enough will find that his woman won’t perceive him as attractive as when he is somewhat jerky. However, sweetness in a woman will never cause a man to see her as less sexually attractive; quite the contrary, it will increase his perception of her femininity and increase her sexual attractiveness in his eyes.