I agree half-way with oomis. Such an approach will work great for the more responsible, mature young adults, but may not work so well for the others. Also, such an approach would generally work great for the children who grew up in a mixed environment, because they are already used to such a concept and would therefore be able to tell what is right and what is wrong, but will probably not work well for children who grew up in a segregated environment.
I also agree half-way with pretty much the rest of you here, and I’m assuming you are all referring to teenagers who’ve grown up in a segregated environment, and in that case, I agree that it would be very difficult to expect them to maintain “kosher” socializing, because they generally won’t know where to draw the line (because they were never told that a line even exists), and therefore, their “natural” instincts would kick in. Which would cause problems.