Currently in the process of tagging: (oral -fellatio -cunnilingus).
And was just wondering about how I should go about tagging the tentacle images. I'm inclined to add the fellatio tag and/or remove oral, technically they would be considered organs. But it seems to fall into the grey area no matter how phallic they appear.
There are also a handful of breast,finger,feet, tail etc sucking/licking images as well, which I believe dont actually warrant the oral tag.