Well I had it done to my son mostly because I wanted him to look the same as his father- didn't want any "why don't I look like Dad" questions.
I had one boyfriend that was not circumcised and it made no difference to me.
This is actually my first post (not that I intended it that way lol), but I felt the need to chime in. I have a son also, and, initially, I was against circumcision. I just didn't like the idea of it, and also didn't like the idea of him going through the pain of circumcision. I'm sure most of the male members here on BL don't remember that pain (and my son apparently doesn't), but I can tell you, his screams could be heard all the way out in the waiting room. This, after the doctors doing the circumcision, assured me that he
wouldn't feel pain so he wouldn't need an anesthetic. Bullshit! It was horrifying, and totally unnecessary. But his (female) physician had convinced me at that time that he should look like his father also. Looking back on it, I would never make the same decision. First of all, it's not natural; why is it so important that men be circumcised? It says something about our culture and our society. And second, there was pain involved; and I was assured there wouldn't be any. It was traumatic to him - and to me, incidentally, as his mother. So if I were facing the same decision today, I would definitely say no to the circumcision.
And as to the OP's original question, I have never had the opportunity to experience an uncut man, but I would definitely not be turned off by that; in fact, knowing myself the way I do, I would probably find it rather titillating (no pun intended, lol). I think that when women -or men- base their personal decisions on societal "norms," that they are closed off from what could be their own unique experiences. And I would rather have my own unique experience than judge someone based on what our culture perpetuates.
So to answer the question, OP: No, it definitely would
not be a deal breaker. I wouldn't have any problem with it whatsoever. In fact, it's my opinion that society shouldn't place such importance on what is, essentially, an unnecessary and painful surgical procedure. No, I wouldn't lose interest; in fact, I would probably be more interested. And no, I don't want or need to be told about it beforehand. In my opinion, any woman that needs to be told about it before submitting to sex and/or loses interest based on your your appearance (in any form) probably wouldn't make a very good girlfriend. Just my 2 cents. If you care about someone, it shouldn't matter. It doesn't to me, anyway.