I mean they tend to volunteer more but its school stuff and sorta cause they have to. Its amazing actually when you are at volunteer things how many childless folks are there. Then again there is the whole time thing. When it comes down to it if you have kids that is basically another level of responsibilites. Even just being married increases the load but it also decreases it so its kinda evens out (ideally, depends on realtionship) and kids when they get older should start evening it out to but again it kinda depends. The kids that do volunteer of their own volition are usually pretty great.