I believe I have to clarify some points here...
I did not know the model's age, until after I knew all the other details about the hotel room, foot modeling, lingerie, etc. As I learned more about the type of shoot that this man was requesting, the more weary and uneasy I got about it. As I started to talk to him, he first mentioned that it was going to be a "senior photo style", he later elaborated on that it would be foot photos, and that the model (who at the time I didn't know her age, as that bit came after everything else) was only 15. That was a bit alarming, but I do realize that foot models are needed for magazines and ads to model shoes, socks, and other foot attire.
My stance on shooting erotic images definitely doesn't mean that I would go through with this particular situation. After learning of the model's age, I declined his offer, because the model herself was underage, and not knowing any of the legal matter, and after looking it up, finding that there is a bunch of grey areas, I declined. I knew that I was going to decline the offer even before looking up the legality on photographer forums. I simply wanted to see what other photographers have done, as this would have been my first gig. Furthermore, the suspicious situation of the model and her supposed father and their request, made me decline the gig.
I am more than comfortable shooting nude photos of people in an artistic sense, as currently being a nude model myself at my university, I have come to appreciate it. But of course, due to the model being a minor and under the age of 18, I declined the photo gig. Like I had said previously, had she been 18, I would have considered doing it, yet still with high caution, but she was not 18, therefore I declined it.