is urethral sex possible?
Yes, it is... It can end up being disfiguring, but think about it: A woman's vagina can stretch to accommodate a baby's head, or fists, or even an adult head (god forbid). Earlobes stretch immensely to accommodate gauge 0 earrings. Of course a urethra can stretch to fit a penis. Apparently it feels the best when the penis actually reaches the bladder. The human body is incredible.. and incredibly disgusting.
one could find more if one looks