This all boils down to being adult, even if he was already sexually active, WHEN you are the teacher and even if he made the first pass, you know how to handle it and END the situation. I realize men feel they have to play the macho game and make sexual jokes, but this is not funny and it makes my blood boil. I worked very hard to screen and protect my four kids, i hope i succeeded.
I agree with you, and adults should be adults. Good luck on the kids!