100% right - we're evolutionarily honed to find these attributes attractive.

Here's the interesting origins behind them:

1. Large breasts: Potentially better for child health and feeding.

2. Full Hips: Better for child bearing and hence better odds of successful birth.

3. Flat stomach: She isn't already pregnant hence more desirable.

Isn't it funny how "sexy" features are after-all the result of pure evolutionary expedience?

It's the same for what women find attractive in men - height, musculature, confidence, charisma, boldness, honesty, etc.

All those signal a high-value male who has better odds of "survival" evolutionarily