People focus on breasts because it's an obvious thing, but the fact that people focus on this stuff alone is sexist. Why are the big jiggly boobs any more sexist that the muscles on the dudes?
DoA takes the human form to it's extremes, meaning the obvious stuff like breasts are exagerated, but that's not the only thing that is exagerated in these games, it's just the convenient thing for these discussions. I mean, how long have DoA breast physics been a focal point for discussions on sexism in games? - forever, well at least since DoA volleyball.
We know! - we know that in DoA the girls have rediculous boobs, we know that they don't represent women, just like we know the big muscled dudes with chisled jaws don't represent men. I really think that a lot of women make assumptions and get the wrong idea with this stuff. I mean, we might see a DoA character, and only ever look at the jiggly boobs, but that's just it - we're appreciating the boobs, we aren't somehow confused and thinking that those boobs represent women, or womens boobs, or anything except for an exageration designed to target a deep-seeded genetic reflex that we have no control over. It's not fair to hate on men for looking at boobs, that is like men hating on women for having a period.
Besides, I always thought the most sexual fighting game character was Cammy (camel-toe Cammy) from StreetFighter, and she doesn't have big breasts at all.