Sensual Goddess almost falls into this category. She advertises rarely on LL. When she does, she doesn’t bump her ad and just lets it roll off the site. Her ad is up now from Jan 30, and when it’s gone, you likely won’t see it again for a few months. I can highly recommend her, but she is selective. Be pleasant and descriptive in your email introduction and you’ll be in for a good time. She’s based in the Newton area.