This is a hugely complicated thing that society really hasn't got its head around. It's very easy to pay lip service to the concept that you want your husband/boyfriend/partner to be sensitive emotional and open and I think many people do exactly that.

However, when they find a boyfriend who is emotional, sensitive and open - it doesn't marry with their view of what a 'man' should be as ingrained in their childhoods and in particular by their father. If you had an emotional father (and I didn't) then this is a strong influence on what you think male behaviour should be. When you have a strong, relatively emotionless, closed but good provider type father - this is influential too.

No amount of telling everyone you're progressive and love open men will wipe that away - and thus we have the jokes/sitcom set up of the Bruce Willis in Friends thing... be open to me, but not TOO open - because then you're unattractive. There's truth in them there comedic hills.