Asudem Latex, who'd found a picture she thought I might enjoy (see right). I certainly did, so I traced it via Tumblr first to here and then to photographer Daikichi Amano. I don't see this picture on Amano's actual website, but you'll find plenty of other weirdness there, if you decide to have a look.
Anyway, Amano's tentacle pic put me in mind of the famous painting at right below, Dream of the Fisherman's Wife by Hokusai. I wouldn't be surprised if some of you already have that one as your desktop image. ;-) Or if you prefer something else along the same lines, just plug "tentacle sex" into Google Image Search to see dozens of other choices. That's how I found the third pic in this post, by sculptor Rune Olsen. It's so rare to see a man getting in on the hot tentacle sex that I couldn't resist sharing it. ;-P