Other than the exact reasons, I thought this was common knowledge? The Google was able to find me some good sources. Have you heard of The Google? It does a lot of great things when I need to find general information.
First result is this
http://www.theatlantic.com/sexes/archive/2013/07/dont-fear-the-male-babysitter/277924/
Which cites an entire book written about this knowledge
http://www.amazon.com/Babysitter-American-History-Miriam-Forman-Brunell/dp/0814728952