Though not as cutely-illustrated as ASAPScience’s stuff, Michael Stevens of VSauce goes into some interesting depth and detours here about the science and evolution of kissing.
Some of what he covers in this vid include: Kissing is healthy for us, it’s probably been used as a “Taste Test” part of mate-selection for well; -ever, Don’t go all Silverstone but Kissing was probably used for the world’s first and maybe healthiest baby-food, and into the darker areas of science, the fundamental drive for attachment, even outside of a provider.
It’s less strictly-on-topic than many of the talks you see about this, say by Helen Fisher, but in this case, Michael’s detours are less obvious, oddly-interesting and eventually circle back to the main theme anyway.
That and over 11 Million YouTube views is not too shabby, either.
YT-“Why Do We Kiss?” by VSauce