Your urethra is inside the shaft. Foreskin What are the parts of the male internal sexual anatomy? The testicles are 2 ball-like glands inside your scrotum. Tr. Balls-Internal Packaged. Trailer Ball /8 x 3/4 IPkd. 2, lb - Black Retail Packaged. Item#. P. You must be logged in to order this item. Hi girls, I went to a sex toy party a few months back and bought some of those internal balls to help improve my pelvic floor muscles (they're ok.