Holding thumbs!
This'll do in the meantime though - A clickable swivelly interior with choir and all.
The Vatican provides...

What a great site. I particularly loved this short film:
I wish I'd seen this video yesterday, so I could've told my valentine that I wanted to passionately juxtapose my orbicularis oris muscles against hers. (Well, maybe it was a blessing that I didn't see it in time.) Anyway, the factoids are still fun: 90 seconds of scientific and cultural tidbits about kissing, presented in animated infographic form. Watch and learn:
The Kiss - Infographic from Marija Vidanovic on Vimeo.