Find yourself playing with your pussy or tickling your clit when you are sitting at your desk or have a large book with a jacket or sweater on your lap while at bookstore or coffee shop. Maybe not actually doing that in public or just thinking it would be exciting. I guess at times thinking about doing wild and/or extravagant activities are just stimulating as doing them. I guess it could be done safely in simulated environments. Perhaps it's wishful thinking.