It is probably a sign of getting older, but I find tongue in mouth kissing quite distasteful, no, not really distasteful, just boring. I have a vague memory that it can be good. Very vague.
Tongues fighting to explore each other's mouths. Is that lamb or parsley stuck between your teeth? Worse is when you accidently find a plate, that is false teeth. Why is good? I can't remember. I suppose it is a part of the general sex act. The last time I did it, I was mentally writing a food shopping list in my head.
I think you can get far more germs from tongue kissing than oral sex. Oral sex is good, for a few minutes. Not to the point of me having lockjaw or a bruised throat, or if I am the recipient, again writing a shopping list
What about sticking your tongue into someone's ear? I just love lapping up ear wax and I love your slobber all over my ear. But when you stop, my ear gets cold coz it is wet. While I may confess that full on kissing could still work for me, ear stuff never has.
Perhaps I need to get out more. Perhaps I went out too much when I was younger.