Do you realize that this girl is a few months away from being completely legal? Do you realize that she is legal in a shit ton of first world countries through out Europe? A couple of years ago she was over a year older than the age of consent in Canada. Wanting to cut someones dick off for fucking her is insanity. I question your mental stability more than that of the man she ran off with. You have been brainwashed by the government. Your attraction to girls who are a certain arbitrarily selected age is almost entirely a socially programmed illusion, biologically you are wired to be attracted to post-pubescent potential mates. You barely need to go back in history at all before it was common and socially acceptable to take wives younger than this girl. Your opinions are entirely a construct of the social environment you have been raised in, they contradict your very biology and indeed are at odds with almost all of history and much of the worlds present beliefs. It is highly doubtful that you can even differentiate between 15 year olds and 18 year olds based on physical appearance so if you are physically attracted to women you are physically attracted to 15 year olds. It is simply a fact of life, the average age that full sexual maturity is reached is approximately 14.5 years. I think it is off putting that he is her teacher as well. I don't judge people who are 36 with 18 year old girlfriends and 15 and 30 is not a big deal either. What is so off putting about it? He didn't force her to do anything did he? What sort of a naive world have you grown up in where you perceive 15 year olds as being little children still?