So a few days ago, WWE posted a picture on their Instagram of Bayley, Sasha Banks, Natalya, and Ronda Rousey after a match. If you look at Sasha's stomach, you can see Natalya has her hand near Sasha's ribs and Sasha has her hand over Natalya's fingers with an expression one would make after being tickled compared to the other three in the picture. I believe Sasha Banks is ticklish at least on her ribs/stomach.