Just from a photo of a man, can you easily predict how long and thick his dick is? I'm interested in designing a deep-learning algorithm for this purpose, but the first thing I need is a large enough data set. If I were gay I could gather the measurements myself, but I am not, and don't have/want any gay friends.

Does anyone know where to find reliable data on penis size, together with suitable portraits? Or better still, has anyone seen this sort of project before, so I can just work on that?