@Shadowman311 I once worked with a guy who had a freakish level of knowledge about the dynamics of adolescent marriage - I don't remember much other than the unease, but it seemed like it's all taken care of with parental permission. Repair the family unit and it's not a problem at all: Good parents wouldn't allow an unhealthy marriage, and they're the best judges in looking out for their kids, case closed.
It's such a pointless argument to have, of course it's used as a wedge issue because it welds together a little bit of every weird subculture's hot dispute topics: Marriage, pedophilia, feminist nagging, sexual morality, 30-yo "adolescents", revenge against bitter roasties, etc