Note to the world:

When I say (or type) "interlabial", I am not talking about a sex act. I am referring to the labia oris a.k.a. THE LIPS ON YOUR MOUTH, not the labia majora or minora. This is an artifact of that time I flunked out of Linguistics, which is also why I can tell you about your alveolar ridge.

Rest assured, I am extremely unlikely to use any of these terms when describing a kiss.