Huh - I wonder if you could use that as leverage during pay negotiation.
"Oh, you don't have any other women on staff? You need to know that thats going to be sort of rough for me, in complicated gross ways. I'll still do it, but only if you pay me an extra 10% compensation pay on top of what you were otherwise going to pay me. (Which you can stop doing as soon as you hire another woman)."
As a man, this would make me extremely uncomfortable for a lot of reasons. Not the least of which because it implies to me that you think all men are scummy creeps and that you need extra money to deal with us.
That's a hell of a reach from what she said, to put it mildly. To justify your inference she would need to be asking for extra money for dealing with any men, ever.
"Oh, you don't have any other women on staff? You need to know that thats going to be sort of rough for me, in complicated gross ways. I'll still do it, but only if you pay me an extra 10% compensation pay on top of what you were otherwise going to pay me. (Which you can stop doing as soon as you hire another woman)."