No, that isn’t a mis-spelling (mispelling?). It refers to the fact that this position is becomes even better when the woman tries to touch the soles of her feet to the soles of the man’s feet.

This position is supposed to be the best for the woman to achieve orgasm. By pivoting her pelvis in the way that is required to get her feet down to the level of the man’s feet she brings her clitoris in more direct contact with the motion of the penis. The result can be quite explosive.

Oh Lordy Mama!

Eleventh Posture Of The Perfumed Garden - Touching Soles