This is probably grooming or cleaning behaviour,but most people seem to like to think they're kissing.
Going by the differing lengths of the beak,they do seem to be a male and a female.
Kea is the Maori name by which these native 'alpine parrots' are commonly known.
Their taxonomic handle is Nestor notabilis.
You can read all about these fascinating birds here in Wikipedia: en.wikipedia.org/wiki/Kea