For me the ideal size is a G-cup, and I'm betting this will become a very standard size (in porn industry) in a few years.
We already have some big name with a G-cup :
As much as I love huge tit babes Miosotis Claribel, I disagree. I feel G cup and above will continue to be a large niche sub genre restricted to a few popular sites like Scoreland.
Depends, I think it's more about symmetry... Boobies completely out of shape or oversized aren't really so attracting. Bigger women can have bigger body parts without being "fat" compared to smaller women. Smaller boobies have benefit that they tend to be more sensitive than bigger ones, if you like to play with them. But to be honest, if I really preferred flat chested women, I'd be topless and fingering myself next to mirror... Boobies are kind of one of the signs of womanity.
This is where "Beauty is in the eye of the beholder". I prefer flatter chested women - their breasts are much more sensitive, they feel great to the touch and it makes it easier to get truly intimate with them. The 3 women DuanColo posted above would all get me truly fired up
Elle Alexandra is stunning with her 32A chest. I loved Zoe Voss pre-implant more than now.