As the lead dev for Sexcoin, I can tell you its not dead.
Our growth has been rocky, you can figure that out simply by reading through the threads. The original dev disappeared and a few of us that saw the potiential picked it up and kept it moving. If anyone is truly curious about the history I'd be happy to go through it, but will spare the thread the long read.
The russian that keeps being mentioned is a passionate supporter... and she's pretty hot

She can see the potential, the way the rest of us that believe in Sexcoin see it.
Right now, we're getting ready to release a new client that has age verification features. Cam-to-cam and token sites have always been high on our list of places sexcoin can carve out a niche, and age verification get's carried on the transaction level, so sexcoin can be sent with age verification attached. When the coins show up, it also reports if the sender has confirmed being over the age of consent, over 18 , over 21, or if no verification is given. We're hoping this can set the stage for deeper adaptation.
Past that, the potential we see is for all things adult oriented. From pay-per-view sites, to micro-transactions on porn sites, to adult toy-stores, to local fetish economies like artisans and service providers. Pretty much anything you would want some descretion involved in the transaction. So the android app ( which has been available ) coupled with age verification creates a pretty strong foundation for a coin.