There was a Joy, who worked at Napa Thai in Duke street about a year or so ago. She fits Tiggerman's description.
If it is her, I saw her about 3 times and she did give a sensual/teasing massage, but was adamant that she wouldn't give a HE...so I gave up.
Having looked at the location and the fact that it's in a beauty shop, I think I'll pass on this one for now, unless someone comes back with conformation that more is on offer.