Kissie Marks
Credit to Kathryn and Kennedy for helping and thanks to Trace for testing.

If you are using Rez Hacker then simply copy and paste.

Ok, scroll down to the body parts list and change the end -1 to 2 on either cheekL or cheekR depening on which cheek you want to kiss.

45, 18, -1, -1, -2, -3, 8, 2 //8 cheekL

or

45, 18, -1, -1, 0, -3, 8, 2 //9 cheekR

Scroll up a bit to the textures list and change the \art\autobuild\cottonwhite.bmp 0 to \resource\clothes\nameofyourbmp 0

For example...

[Texture List]
\art\autobuild\hair3.bmp 1
\art\autobuild\clear.bmp 0
\resource\clothes\abs_lipred.bmp 0