On my main account which is this one, I use mostly a male avatar. But I also have another account where I use both genders. I have friends who do that too. There's nothing wrong with it. You just have to be open minded to these things.
Well before I got my second account I was watching my niece for the day. And I let her make her own avatar and run around exploring Home. Well despite having the name Bob, guys still hit on her lol. That's one of the reasons I got a second unisex account.