I have two daughters now fully grown. Many times we employed baby-sitters. I and my wife, just would never have employed a male. We did not even discuss this. Just never considered a male.
I put it down to just a "gut feeling". The bed rock of parental disgression.
My BIL was babysat when he was 5 by a 12 year old boy in the neighborhood and was molested by him. I will never leave my 8 and 4 year old boys with any male at any time, cept if they are my sister's boys as I trust them. As a mother I have a good sense as to if I should leave my boys with a teenage girl or a teenage boy. Mostly my kids are left with grandparents, but I use the teenage girl next door who is very trustworthy and a cheerleader at the local high school. Just something about leaving them with a male gives me the creeps. I would never do that to my kids!