When your opinions don’t hold sway with your students, consider using Heather’s approach and have your dancers listen their way in to the work of famous choreographers.
I seriously doubt that any harm is intended. Some say it’s about money and winning – shock value in the truest sense. I can only conclude that the decision to imply or impose an adult sexuality upon one who is not yet an adult, comes down to poor judgment. This does not release anyone involved from responsibility. When we work with children the standards must be higher and the choices must not be careless because children cannot truly choose for themselves while adults are guiding and influencing them.