That's what was my take from the article as well, it focused on performance base on single-sex vs. coed school education. Would this be an issue as well, if we

That's what was my take from the article as well, it focused on performance base on single-sex vs. coed school education. Would this be an issue as well, if we had mandatory clubs and after school (coed) activities as well. Are we not confusing two things here? On the one hand, because the mandatory institution we have is school, and we consider getting to know the other sex an important part while growing up, we conclude that school should be coed, so to force the latter intent? Also, isn't interest in the other sex somewhere natural and could result in a higher after school coed activity (clubs, sports, ...) in those going to single-sex schools?