We have seen people wearing masks in VH. I assume VH has no problem with that. But in my opinion wearing a mask or not has nothing to do with voyeurism, although we, voyeurs, are not happy about that, it doesn't remove the fact that we are "spying on people engaged in intimate behaviours, such as undressing, sexual activity, or other actions usually considered to be of a private nature" which is the fundamental meaning of voyeurism.