first i find a model that interests me...then i ask them if they are ticklish, then i ask would they be willing to do it and will they tickle another girl and who would that girl be?(i never just assume), then i ask if they are willing to take it for an extended period of time. after i satisfy myself with all my inquires and that they are confortable with and willing to do it and not just go thru the motions then i go for it...the models almost always usually end up loving it..they say its a nice change from the other stuff...