Women are culturally groomed to be caregivers. Women have to deal with the pregnancy head on. Physically it is not something they can get away from. Men can go play ball, drink with the boys and go on with their lives without ever physically having to deal with the pregnancy. I suggest that men walk around for 8 months with a plastic bag.
Every month add some weight.
See if their attitude doesn't change. Male only support groups and mentoring options. Men open up more to other men. Men take criticism from another man better than they can take it from a woman. I have seen grown men cry in the all-male support group setting.