The first man.

A couple of nerdy questions keep popping up in my head lately.
Who was the first guy (or girl) to eat an oyster? He/she must have been really really hungry...
and when was the kiss invented? Was there a logical progression from a kiss on the cheek to a tongue-twisting French slopper, or was it the other way round?
(Maybe my pal BigBuddha can shed some light on this, given his infinite knowledge on large primates and his degree in history.)