My problem has been the muffling effect (or lack, therof!).
So far, we've used tape, which the seal breaks and noise leaks out...and ball gags, which do nothing for the noise level.
I am curious about this spider gag, and butterfly ones mentioned. Any internet references anyone cares to share would be helpful.
After all, with a home full of teenagers that could possibly hear us when we "play", my hubby and I are loathe to be accused of contributing to the delinquency of minors! LOL
Seriously, I need a better muffler........