Oh actually I don't think EH would ever have employed au pairs. sorry.
...anyway to throw in my tuppence,
I don't live in, but perhaps it's because of my age, and the fact I make an effort to be very fair handed, that I don't let things like my sexuality, or some of my "hobbies" intrude into a childcare arrangement.
I can see it would be more difficult to hide the fact that I sometimes enjoy going out, getting completely shitfaced (pardon my french) and staggering home at 6am if I lived with a family. At the moment I never, ever, ever mention those kind of antics to the children or their parents. I don't think it's a particularly constructive use of my time but I make an informed decision based on how much I enjoy it vs how bad it is for my health/bank balance/self esteem. Sad to say getting wankered often wins! But it's not something I'd want to encourage children to do. Neither would I want them to think promiscuity was "just something adults do" - I sometimes feel uncomfortable mentioning my boyfriend, as they've asked a couple of times, "So.... you and he share a flat, right? But you're not married...." and I reply with, "Yes, we love each other lots though."
I feel certain aspects of innocence are about believing adults are always sensible.... let them feel safe with us for a few years, at least, before they see us making horrible self defeating mistakes.
At 18 I was living with a married man who left his wife for me, and had been for a year, we stayed together for years. None of THAT comes up in interviews. The fact I joined the mile high club with a woman doesn't, either. I picked up my current boyfriend on the internet for crying out loud! BUT........
I can be discreet about these things and perhaps the OP had a certain stereotype or set of presumptions about lesbians. Quite what they are I can't quite understand.
Whoever had the friend who got grief for mentioning her girlfriend in the interview, I'm not surprised but yes, it does really sadden me to know that there are people out there who think that she is somehow suspect - when none of my sordid past comes back to haunt me because I am able to present the illusion of being a good straight girl in all senses of the word! Life is so unfair. It really sucks. Bloody hell.