Family cums first
The only minor problem isn't being waterproof. The 1 position that you certainly want to family cums first avoid is woman-on-top. Because it's one of the initial places where you step in the hole and falls down.
The art of sex isn't a time-bound activity. In young age one needs to acquire appropriate sex knowledge. It is one family cums first of the ways to make your long and monotonous relationship keep going.
Anybody purchasing a TV has to consider where to place it. Ladies wait while it's in use and nobody is in it. The best thing about it all is that it's completely free!