For me, I have to make an emotional connection with the 'lee. After I feel that she can be able to trust me, I ask her the level one question: are you ticklish? If she says nothing, then I just skip. But if she trusts me and says yes, then I am able to ask where. After getting in deep with said girl, I will ask if I can tickle her softly. This way, I can slowly build her up to do more interesting tickles.