Kidneys we attach to the ureter and the renal vein and artery without removing the old one. Sex organs though, have analogous structures, but parts are different and moved around slightly (sometimes significantly). Attaching such an organ requires pretty extensive surgery that a typical organ transplant wouldn't. read more
Gender is generally not a concern whatsoever when it comes to organ transplants; factors such as the degree of match, size, age of donor/recipient, etc take considerably higher priority. This page may be out of date. read more