Locomotion 'A caterpillar moves in a rippling fashion. It contracts the muscles in its rear segments, pushing blood into the forward segments, which lengthens the front part of the body. The legs hold onto the forward position and then the front muscles contract, pulling the rear segment forward. ' To describe the sensations I feel inside by the foreskin I choose the caterpillar locomotion...is like my vaginal 'rings' grabs it and I can feel it moving inside, sliding like soft 'waves' all over and when I am the one thrusting ..its a very unique sensation too. Ladies, do you feel a penis with foreskin any different inside you ?