Hi @Cyclo, I was so worried like you, after 18 months of treatment and mastectomy, I wanted to meet someone but thought no guy would be interested. I found a similar online forum like this but US based and a lot of the women said that the men really didn't care too much and I remember one said that her guy preferred a happy one breasted women to a two breasted women who was unhappy with life. Anyway I took the plunge and only discussed my history when I thought things were going to get serious and we were falling in love. He was only interested that I was ok and things continued normally. Now I am about to have a reconstruction and he said that he doesn't even notice that I look different. I think it bothers me more than him.
I think in any situation there are guys that are losers no matter what. So enjoy dating and try and be fussy and find a guy you are happy with first. I also found a good website called baggage reclaim which talks about relationships, it is quite interesting. Though I certainly don't pretend to understand men, I have found they are pretty simple creatures who want to be loved and feel good about themselves, they really don't care as much about the things we let bother us. Good luck.