Interesting post :) To a degree roles are negotiated and should't be expected. When it comes down to biology, the role is quite simple, if you want children and you want what is best for them (breastfeeding, time with mom, time with dad) then it is IMO best to accept traditional roles such as work and provide resources if you are a man, nourish and maintain the child and household if you are a woman. As a man, you should be mature enough to devote your whole being to making the best possible situation for your family. If children aren't involved IMO it doesn't really matter and is up to the couple.