Reading through this thread, I found someponies talking about anime creating unrealistic expectations so I wanted to mention an anime-style game that might be changing perceptions - Disgaea!
Disgaea from its first game has had two main characters with, brace yourself, flat chests! Don't believe me? Here's Etna:
I personally find her very attractive.
The other is Flonne:
The main male character Laharl is comfortable around his two flat-chested companions. At one point in the game, he is confronted with succubi and nekomata - two races in the game with big boobs and he admits to large breasts making him uncomfortable.
As the series continues, the game continues to provide female characters with large breasts (succubi and nekomata being the most famous) and flat-chests units (female archers). The 4th game has something of a "political" feel and one of the girls straight up asks if you are a ReBOOBlican or a DemoFLAT. Oh, and if you talk to a Nekomata, one of her comments is something like "I always catch demons staring at my chest - what's so fascinating about these lumps of fat anyway?"
Anyway, my point is that Disgaea is one video game that presents women as pretty both with big boobs and without. Beauty Queen Etna gives women a sexy cosplay without needing padding.
If a woman is facing me, first thing I notice are her eyes. If she is not facing me, well...
And I would disagree - breasts are attractive because cleavage resembles butts, not the other way around. Butts are not attractive because they look like breasts, butts are attractive to males because, well, if you are engaging in coitus like just about every other mammalian animal THAT is what you are looking at if you get my drift. Focusing purely on the physical, if a girl has a lovely flank, her boobs matter very little to me.