I swear I read this years ago, but I don't remember where, and I don't remember the term? It's french kissing - but much more than that. It's a thorough exploration of each other's mouths (mouth?), and it could go on for hours.
Hentai
Neptune, the two you just gave were literally "french kiss" and "deep kiss" in English. Which doesn't make them wrong. Just clarifying because I've seen several times where a person uses a word thinking it's Japanese when it's really just the borrowed English word rendered in Japanese characters. Yes, Japan has a ton of borrowed words, but if one were writing and using those words, it makes more sense to just render them in English.
Things I found and can never unsee:
- Japanese invent french kissing machine
- Eyeball licking: the new french kissing craze to strike Japan
About the eyeball licking thing? Sorry folks, but that one just isn't true. It was originally a story on some online japanese tabloid site that got picked up and went viral. It's not true. Yes, Japan does have some pretty odd trends at times, but this one isn't one of them.
French kissing burns about 25 calories a minute!
... another thing to consider is whether french kissing actually occurs to begin with.
It's possibly it may not, in Japan.
Just like nose-rub kissing doesn't in the Lower 48.
Customs vary. So if you're finding scant material on french kissing
it may just be that it doesn't fly in Japan.
(Women are so pretty in the country maybe couples simply virtually kiss?
A mere look at a gal being quite enough for their suitors till the time comes about for other stuff.)