A blog on sex and virtual worlds by a virtual escort.
I don't think they were purposely looking into SL sex; the author just used a story about an escort randomly wandering by to spice up the beginning of a rather rambling story about the SciLands sims and SL and science and all. Sex sells, after all... :)
You are probably right. I just wish that there were some systematic surveys being done here with real academic backing.