There was a post on here once of a therapist in a spa that did respond to a client (male client, female therapist), they realised nothing could happen while he was a client, so they ended the client therapist relationship, waited a few eeeks and started dating. In the meantime, he started having treatments with another therapist at the spa, which was a challenge for the original therapist while they were waiting to start dating. Once they did start dating, she just couldn't get the idea out of her head that he was doing all the same charming/quirky/entertaining/sweet comments with the other therapist she worked with, because she now realised he did that with everyone, and the other therapist was getting to see her boyfriend pretty much naked. She couldn't cope with it at all.
Could you cope with the idea that someone you were dating sees lots of almost naked women all the time? It might be a non-issue, but it could also be a big issue. It's like getting involved with someone while they are still with someone else, you eventually get them, BUT there may be that little niggle in the back of your brain "he was unfaithful befoer. what is there to stop him doing it again?"
Alll in all, it's a horrible can of worms, for both of you - if you say nothing, it's only you feeling uncomfortable, he will be oblivious, he may pick up on you being a bit odd, but he won't know the specifics.
Well I'd have to say the reason I'm attracted to him is the same reason that women are attracted to men in the first place - he's handsome, intelligent, professional, around my age, etc.
In Sydney, that usually means gay.... Seriously, are you sure he is even available? I'd recommend treat it like a movie star crush, it would be lovely, but it isn't going to happen.