Thanks for the comments, yep that's about what we suspected from the TGP side of things. With regards to scale, we could easily expand this to 10million images with no real effort if we actually attempted this seriously and not as a semi-accidental byproduct.
Given current feedback, we might just offer free collage web based services (upload a photo, get a collage by email) to make pointless massive montages and kill the rest, we have no interest in marketing our own adult brand, and we're well aware that everyone has gone video/tubey.
I agree entirely on the traffic point, but we're unlikely to bother setting up affiliate programs to test the conversion rates.
Any idea what an appropriately short sex-related 8 letter .com / matching mobile domain name with 160-170k fully indexed adult links, a couple of first page popular term results and Google sitelinks is worth?
An interesting dabble in the market, now probably back to more serious matters
If anyone has any questions you're welcome to send a PM.