From OKCupid:

The chart pretty much speaks for itself; I’ll just say that the numbers for all three brands are for  30 year-olds, so it’s not a matter of older, more experienced people preferring one phone to another. We found this data as part of our general camera-efficacy analysis: we crossed all kinds of user behaviors with the camera models and found we had data on the number of sexual partners for 9,785 people with smart phones. We dropped what we found into Excel, and  voila.

This is part of a larger article where OKCupid did a statistical analysis of photo ratings they captured through their site. The best part — 11.4 million opinions on what makes a great photo.