I don't get why manga artists these days are so obsessed with drawing people sticking their tongues out and rubbing them together mid-air. It's like they all only learned about french kissing by watching Japanese porn videos.
Yeah, also japanese porn stars are THE WORST at kissing. I mean truely awful.
Why? You kissed some?
Do not confuse porn with reality. Or you'd end up feeling inadequate and/or hurt your partner.
And about this, by definition there's nothing much to show in a French kiss from an external point of view, except two interlocked mouths. The rest happens "off camera".
So hentai artists often end up showing it happening outside because they feel it's something the reader wants to feel/see and in the end, it looks totally unnatural. And sloppy.