A couple of times when I've phoned parlours for details some guy has answered, which has put me off visiting on that particular day. If it'd have happened on my first ever call to a parlour it would probably have put me off for life as I don't want to talk with some bloke about how big some tart's tits are.
Personally I prefer it if all the staff I see in a parlour are female as I like to ask the "maid" to join me in the room if she's fit. Can be just as off putting as well if they have workmen in the place, things like that should only take place out of hours.