"For me, that is a huge part of feminism - liberating both men and women from the gender straitjacket society has put on them. That's why Fm is good for men also, if only they would realise it!!"
I disagree with this slightly. Gender roles aren't just 'straightjackets' they are also codified expectations and behaviours that represent and perpetuate unequal power between the sexes.
When you peice these roles together, they condition males to act as oppressor (mostly without realising they are being oppressive) and to condition females to accept the inevitability of their oppression by males (and in fact to glorify submission/pain/endurance/putting others first in women). And these codified behaviours when put together enable men as a class to continue to oppress women as a class.
So really men are only going to feel liberated from their role if being an oppressor truly isn't what they want, and in fact an equal relationship with women is what they want. This will mean relinquishing all the advantages being born male has given them over females.
I think many men, hand on heart would not actually want this. 'Advantages' are everything in this world and very few people are willing to forsake themselves for the general good.
I'm not saying that there aren't nice men out there who would be willing to forsake themselves and even find the rewards of companionship and collaboration with females worth the losses, but I think they are not the majority.
From what I've witnessed there is usually a massive gulf between what people say (I respect women as equals and the more in power the better) and what they really want (women-abusive porn on tap and to be 'one up' in all cases)