You should hire the best coach-period.
It's patently unfair to the female athletes to hire a less qualified coach for them simply because you want a female over a male because you are assuming all male coaches want to creep on young women.
Now if all things are equal, I would probably defer and hire the female coach.
Ahhhh the tough decision:
Slightly better coaching vs. sexual absuse
hmmmmm tough one and your going with the better coach.