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I think this much detail about an adult "teacher's" teen age fantasies would gross out the kids.
Most of us remember being young and how upsetting it was to imagine our respected adults in connection with sexual behavior.
Instead of building bridges, this woman is connecting sex and gross in the same sentence which is diametrically opposed to the aims of this class.
Time to remove this person from a position where she is talking inappropriately, and trying to be a teen, rather than an older mentor. It does not matter what church this, or how liberal the parents. She is not helping the kids to a healthy attitude towards sex.