I'd never go below 18 but you do realize that 18+ standard is only a western standard and that there is a large world out thereA bunch of Jared Fogles in this thread. And don't try to justify this shyt by saying its ok in Europe or Asia or wherever, I've been to over 20 countries lived in 4 different countries, still doesn't make it ok.
15 vs. 17/18 is a huge difference in both in physical and mental development. Sure, 17 vs. 25 is still a huge difference but at least by 17/18 you can expect most girls to make decisions on their own and not be manipulated (notice I said most).
Its quite arrogant of you to say
"America's got it right all yall other cultures and countries are wrong because America is smarter"