Mortal Kombat always had a lot of kiss type fatalities, but there's actually a spot in the story where we get a full frontal kiss death.
https://www.youtube.com/watch?v=5kgIlNj-H8o
Character: D'Vorrah
Type: Direct
Effect: Death
Look for the 1:08:50 mark. D'Vorrah kisses Mileena and...well...you'll see.
BlackLips, you might like this one especially.