Just ask, carefully, gently, something like, 'do you do any more?', as if you're embarrassed to ask. Shy and feeble yes, but if the answer is no, and it has been, you just apologise, and carry on. In many years only once or twice have I not read the runes. Once was a Chinese woman, who advertised massages on a massage forum where massage is secondary, shall we say, weird. In the adverts, if they show a picture of themselves in something sexy, then it's a signal. If it's all buttoned up, then it's a signal of a different intent.