My partner works full time and is also right now my full time carer. Makes all the meals, does all the washing. The jobs I do have I sometimes cannot do during a bad day, and he'll take them on without being asked too - just from seeing me unwell in the mornings. He physically helps me around the house when i cant walk well so I can at least get up and down stairs on those days (cant afford rails for the house yet). Goes out and does the shopping. Even manages my doctors appointments when I can't.
He will, effectively, do everything for however long he needs and not once has he complained. I bring it up often, out of guilt obviously and concern for his stress and energy levels, and he just says he loves me and we're a team, and he's happy to do these things. He says its not stressful, just extra things to do.
So no, I don't think they are inherently lazy. I think a lot of men are lazy because their mothers didn't expect more of them and their fathers taught them that women should do everything thats unpaid - I think it's nurture, not nature.
My partner was and is loved and spoiled awfully by his adoring parents, but they also raised him to be independent, proactive and caring towards others. I'm in awe of them actually, they raised two very lovely 10/10 sons who make fantastic partners now (my DPs brother is the same). Seems very rare. But proof its possible!