I don't have or want children, but lets face it, they can be VERY funny.
I remember Dylan Moran doing a bit about his toddler that had me in stitches, and one whose name I can't remember right now, but his thing about his child being weird, and referring to himself in third person, and that was very very funny.
it's good to hear about their funny moments without having to deal with all the rest of it.
also, I loved Sarah Millicans "we can't have children.....because I hate them"