Quote - If model age is a question and your friend still insists on using these particular characters, then why not just morph them a little older to qualify.  Underage legality solved.

That was something I considered. I also have quite a few original characters I could use, if it came down to it.
I guess I was just trying to see if anyone else had the same sense of cognitive dissonance that I did when thinking about the issue; I was concerned that I might get in legal troubles for creating Virtual Pornography, using a virtual Character, with the main point of concern being that the virtual character might be perceived as being under 18 years of age.
To me, if I turn off my higher brain functions for a minute and just look at the characters, they do appear to have the outward appearance of being modeled on a 16-18 year old female; I know I'm not going to create something that could be misinterpreted as being a video of a real, live female; anyone who sees it is going to know it's CGI. While it is illegal in Germany, for instance, to make or see something like this, it isn't in the US as long as there is no attempt to make people think a real live underage female is involved.
Then, there is the purpose; my friend is setting up a adult website. While i have gone to adult websites to look for pose, texture or lighting research, that is not the reason 99.8% of people go to them; the thought of making money from something like this is...weird.  I don't have any moral opposition to pornography, heck, I like pornography; I've had an account on renderotica ever since they opened. But I never conceived of myself as a commercial pornographer.
Along with most of the country, I'm hurting for money right now; If i could generate some extra money to help buy groceries for my kids by doing a few renders, it would be a major plus.
But the cost is, I think, too high; if the idiots who think teen characters in The Sims 2 with censor blur turned off is child pornography, what the heck would they say about this?