I have a male and a female cat - both are awesome with the kids, so I would say that its a personality thing, rather than a gender based thing that makes them good with kids.

My male cat will let the kids do anything to him, and just lie there and take it. My female cat isn't quite as tolerant however she absolutely adores DS and I quite often find her cuddled up to him on the couch. She was sitting on his chest this morning with her butt on his face. He thought it was funny.