OKCupid's dating science blog has been data-mining millions of profiles to reach some really amazing conclusions about what people say vs. what people do. It's like sociological hardcore pornography.
The latest one is about the
science of profile pictures, and check this fact out:
the MySpace Shot is the single most effective photo type for women.
Not only that, girls actually
like it when buff guys pose without a shirt:

Or at least young guys:
the effectiveness of the “abs pic” decreases sharply with age.
Also, the older a woman is, the more effective it is for her to show her breasts:

This stuff is amazing. I am getting all recursivelyenumerable up in here. Previous mind-blowing posts include
Everyone Is Actually Racist Forever and
histograms of the best words to use in a first message to get a reply.
WE ARE APPROACHING THE OMEGA POINT OF QUANTIFYING MALE-FEMALE INTERACTIONS.
spoiler (click to show/hide)