Centrefold models getting more androgynous

Based on 577 consecutive montly issues of Playboy, researchers graphed trends in height, body mass index, and waist to hip ratio. Wow, that would be a fun job; we always joke about scientific excuses for looking at naked women :-). Anyway, they discovered that:

• BMI is dropping (20 to 18), making models skinnier
• bust size is dropping, and waist to hip ratio is rising, making models less “hour-glass” shaped and more tubular
• height is increasing, while weight remains constant

The net result; models are becoming less “classically” feminine, and more androgynous.

The real question is: are mens’ preferences changing, and is the media (including Playboy) documenting or causing the changes?