Ok, well this is awesome.
A manga magazine that had an article on it came with THIS awesome, and actually legit reproduction, necklace/charm.
Funny thing is, the Romans had (and archeologists have found) tons of these sorts of silly sex talismans! Awesome huh?
http://ebten.jp/p/9784047274969/
I'm also loving the phone charms mixing Classical sculpture clashing with modern bathing items. :)
http://toypara.com/catalog.cgi?products/gasya/termae/home.html