Here is a whole different thread with more information from a previous thread on the same topic:

http://www.bdsmlibrary.com/forums/sh...ght=gags+drool

And another much older one with some good info as well:

http://www.bdsmlibrary.com/forums/sh...ght=gags+drool

And another one:

http://www.bdsmlibrary.com/forums/sh...ght=gags+drool

Anyway...hope the links help!