Well if the picture is obviously a pre-pubescent person, then yeah sure, nighty-night, but look at my Welcome to Sweden picture up there. They all look mature to me, or they might not to someone else, but the point is that it's somewhat more indeterminable in that case.
I'm not advocating for all the lolis and shotas to be able to run free, I'm just saying that it's silly to try to assume what age someone is.
If they outright say that they're 15/16/whatever that isn't 18, then yeah they just bought a ticket out of the site. But if they A. never say or B. say that they're 18 or older, since there's no way for anyone to actually refute that, that's what would be gone by.
Unless you want to start requiring Credit Card info as proof like some big porn sites do, but something tells me membership here would dry up fast if you started asking for that.
Speaking of which, did this start because of me making Linae (Mystic Girl) "underage"? Because I already explained my fix to that, I just rewrote the year system so that she's 21 for us and 16 in her own years (bumped the years to 480 days each).