I was always a little weirded out that no ne ever called out Colossus for messing around with a teenager. I mean, I'm pretty sure that Colossus was 20-21, but really, if you're not in high school you probably don't need to be messing around with high school kids.
Also, if you run a kindergarten through high school, you probably shouldn't let your adult former students hang around so much.
I guarantee Cyclops was banging the kids in between Jean, Medelyne and Emma. Because Cyclops is a creep.