I'm going to take the approach of "evading marriage". The answer will depend on the age of the man:

1. In this day of TV, satellite and internet younger men have mountains of information about why marriages fail and the aftermath compaired to when I was a teen (1960's).

2. Younger men read and hear about older men's experiences and many are afraid they will be the next statistic.

3. Younger people today (teens and twenties) seem to have more sex more often then married couples. When younger men hear this they feel why should I get married only to have my sex life disappear with a woman (now wife) living in the same house.

4. Young men hear their older friends and male family members talk about loosing everything in a divorce. Another fear of marriage.

5. Many women change their priorities after children come. Where the husband was number one now he is three or four yet he is expected to keep her as number one. A rather dissapointing future.

Older men have experienced marriage and many have an unconscious requirement that a perspective bride ABSOLUTELY prove she won't do to him what his ex-wife did. The list could be long but they are just as hesitant to open their hearts as older women are to men.