No one may be “demanding” that standard of others, but given that they teach an abstinence-only class, one could make the argument that they’re trying to present this strangness as normal to their students.
I think one would have to be stretching to make that argument.
I don’t think any of their students will walk away with the assumption that it is “normal”.
But I think that they will know that should any of them make that same commitment, their role models (and all persons in authority are defacto role models for young people) have done so.