I suppose that if we are using the term 'principle' very loosely to mean more or less anything someone does for a reason (or without one for that matter), then your statement may, in part, be true. However, it should be clear from this thread that no one here (or very few) believes both sides are equally admirable. If we did, we would not be having this discussion.
One is not commonly described as 'standing on principle' when one simply does what everyone else is doing. You may be able to claim that the female wrestlers are standing on principle by doing what they are doing, though I would argue that those principles are poorly conceived. So if you are going to argue that both sides stand on 'principle?, and if, for the sake of the argument I granted that point, I would simply say that not all ?principles? are equal. For example, The Westboro Baptist Church protests military funerals on the firmly held ?principle? that the US is evil, that the military is evil and that anyone who serves in the military is going to hell. I would hope that we could all agree that their principles are poorly formed? Obviously that is an extreme example. I am not saying that these two cases are the same; rather, that simply doing something on ?principle? does not mean that the action is admirable.
Furthermore, my opposition to co-ed wrestling is not based merely on the possibility of intentional misbehavior, but on the very thing itself as being inappropriate. I don?t care if both parties are pure as the driven snow. As I said before, I am morally, practically, and prudentially opposed to co-ed wrestling.