Charlie Glickman has an excellent post on his blog about gender roles for men: http://www.charlieglickman.com/2011/05/the-performance-of-masculinty/
It gives some great insight into how harmful for men, even heterosexual cisgender men, gender roles can be. In the end, strong “rules” about sexuality and gender hurt everyone. Yeah, the rules hurt some groups more than others, but in the end, they hurt everyone at least some.