I agree. My sixteen year old girlfriend was screwing her science teacher. She turned out ok.
The Guidance counselor for the tech school kids used to be at the Holiday Inn hot tub every weekend teasing the boys until a few would help her find her room. The Social studies teacher left his wife for a student who then dumped him. Another guidance counselor had a black chevy-van with shag carpet and was caught in mid coitus with a pair of twins. He agreed to resign and got a job as a principal in the Philadelphia School District.
I had to read your post several times before I realized that you meant 'when my gilfriend was sixteen'... If I am wrong and you really do have a sixteen year old girl friend, something is a little strange!