I wonder what is going through the heads of the stupid men who make a booking with a lady, having seen her pictures, and then go off in a huff because she's 'fat'. If you think that size 10/12 is fat you're an idiot, but surely if you prefer skinnier ladies you should be looking for them? There are plenty of size 6-8 girls out there that they could be going to.
I haven't had a client leave because of it, but a fair few of mine have complained that I'm too tall and too skinny. My pictures are accurate and un-airbrushed, and I say on my site that I'm a size 6-8 and 5'9. Shock, horror, I am not actually a size 10 and 5'4. They would waste less of our time and theirs if they looked at the pictures and read the descriptions properly.