
I make it a matter of policy not to cath females, especially ones who are alert and oriented. Yes I know it's sexist since females have been cathing males for eons, and I'm a big hypocrite because I scream for equality in other areas.
But since I have to bring a female in the room with me to do that kind of intimate care on a female, (as a witness I'm not going to sexually molest her), I just send the female in the room to do it for me. I've never ever had someone refuse, but I'm a nice guy and most of the time am the charge nurse.
edited to add: Also, I've cathed many a male patient for female staff who weren't quite comfortable cathing the patient, usually a teenage male or young alert and oriented male.
Sometimes for the comfort of all involved it's best to compromise your feelings and not put your feelings on the other nurse, but respect where they are at.