Honestly, I think by the time guys are 15-16 they are about as mature as they will be until at least 23-ish, maybe even 26-ish, Although I'm still a 23 year old virgin, and might have a bit of a shallow view of these things, but I really don't see the problem, as long as the teen isn't under 16 (which is the average age of consent in the world), and it was "Consensual." It was these stupid rules and fear of going to jail that kept me from having fun in high school when I was still able to get a girls attention, These days I'm a hopeless blob of repulsive flesh, but maybe if I had a "Teacher" to show me the ways of the world, I wouldn't be on my way into an early grave alone and hopeless.