Drooling around bit gag with tongue port: While a bit gag causes some drooling, adding a tongue port causes copious drooling because of how it restricts the wearer's tongue, holding it firmly down in the mouth. If the video isn't displaying properly, you can try the direct link. The video of me wearing the bit gag with rubber bit port is also available in 720p.
Drool is one of those things I love to hate.
I hate it because it's kinda gross, uncomfortable, and distracting. I love it because those same qualities make it humiliating.