I don't think that will work. Biting down will always remain an option. I believe the only truly safe environment, safe for the penis, is with cameras and some semblance of a showbusiness atmosphere. I feel only in this way can the intuitive urge the lady feels to bite down during the more distressing moments can be circumvented by the stress of a performance. Which is easy enough clearly in these days and times as far as the equiptment availability and the diy cultural climate. The thing that holds me back is the paperwork, which I hate doing anyway and I'm certain in this case would be doubly sobering and mood killing.