A lot of people will be surprised to learn that men will sometimes commit to marry their girlfriends even though they are not necessarily romantically or sexually attracted to them. According to a study by Match.com,
Men are more likely than women to be willing to make a commitment to someone who has everything they are looking for in a partner, but whom they are not in love with (31% of men and 23% of women) and willing to make a commitment to someone who has everything they are looking for in a partner but whom they don't find sexually attractive (26% of men and 22% of women).
The truth is that even though men are often regarded as scared of marriage and commitment, they also have dreams of getting married some day and having a wife and kids. Also, men are just as susceptible to peer pressure as women are, and if they see all of their male friends and peers getting married, they will feel a desire to do the same. This is much more so when their current girlfriend is putting pressure on them to walk down the aisle.