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sex-ed and committees scream to me of unitarian universalist youth.
back in my UU adolescence we had an adult advisor with major boundary issues. despite little pep talks and other non-confrontational discussions things never got better, and eventually way too many boundaries were crossed (i'll leave that up to your imaginations). as a youth on the district youth-adult committee, i spent much time dealing with the fallout of this one adult woman's behavior. it's not really an appropriate role for a teenager.
looking back to it, i believe church adults really should have put the kibosh on this woman before things got so out of control. teenagers just don't have enough life experience to deal with misbehaving adults - especially those in authority positions. it will be difficult for them to draw boundaries too.
i suggest waiting until the current class is over, then approaching your religious education minister/director and finding out how he or she would like to handle the problem. i think most RE directors are trained to handle exactly this type of situation.