Now that Steve has deciphered the cryptic question of the original poster (I think? I don't know if it's been confirmed that the OP was trying to ask the question Steve clarified) and Fuzzy Necromancer has iterated the fundamental questions that would need to be answered first before any actual discussion can properly begin, the two questions of his which I find the most pertinent are:
Fuzzy Necromancer wrote:
2. How is any of this the responsibility of high schools, and even if it were how would such a ban be enforced?
Yes, absolutely. It is never a good idea for the government to try and legislate sex like this. At best it'll be completely ineffectual and it will become one of those Blue Laws, at worst it would lead to Orwellian measures being employed to try and root out "those damn perverts."
The government should not be the kink police,
The only exception is when some sort of sexual fetish is actively harmful, like cannibalism or paedophilia, and only then when someone actively participates in the act, directly or indirectly. Someone just getting off on vore or loli comics on the internet is is not licence for the black party vans to come visit. Someone getting video or pics of actual victims does.
Which leads us to:
3. Is there something you see inherently damaging about femdom relationships?
In order to ban femdom relationships, you would have to show that they are
inherently damaging, or at least in violation of some other formal legality. Paedophilia, for instance, is both; there is a lot of evidence from the battery of former victims that it really messes them up and from a formal legal standpoint, a child cannot by definition give informed consent.
Do you have any evidence that engaging in femdom relationships as a teenager somehow leads to psychological harm? Informed consent would not apply here since you seem to be referring explicitly to relationships that form between teens. If it was an adult in a relationship with a teenager, then the legality of that would depend on the local State law regarding age of consent; the actual form of the relationship itself would be irrelevant.
All the other questions Fuzzy Necromancer asked are important, too, but those two strike me as the critical ones that need to be answered if there is to be any discussion beyond "no, and it's foolish to try and legislate sexual conduct."
It wasn't too long ago that homosexual relationships of any stripe were outright banned, after all, on much the same grounds as what OP is presenting.