Even today, 50 years after the quest for gender equality began, most women and men expect the husband to be the primary provider, a role that can impose on men the same restrictions as sole provider.

That means men still focus on money-making far more than women. Most men feel they need a good income to attract the other sex and gain society's respect. Unlike women, they often link their self-worth to their net-worth.

The different roles have instilled in the sexes a different psychology regarding money. 

For much more, see:

"Salary Secrecy — Discrimination Against Women?" http://malemattersusa.wordpress.com/2014/10/27/salary-secrecy-discrimination-against-women/