Why Men Marry (or Don't)

Student writing a three page research paper on: Why men marry.

He had a few ideas:
-religion
-social pressure
-family pressure
-love
-money (that one was mine)

I could not find any articles in Academic Search Premier, SocIndex, or PsychInfo by searching:

Marriage, commitment, men, male*, martial status, and others that I have totally forgotten.

After switching his topic, he choose: How cocaine is healthy. *sigh*