Sitting In a Tree

Sitting In a Tree?

I'm not actually sure what this one is called I just call it that. An example:

"Boris and Blessed sitting in a tree, K-I-S-S-I-N-G"

another example

"Boris and Blessed sitting in a tree,
K-I-S-S-I-N-G,
first come love, second come marriage, third is a baby in a baby's crib"

something like that... well I can tell you there are a lot more lets say naughtier versions of this song but I'm not sure if I'm allowed to post them on here ;)