Nullification

Nullification removes external genitalia while preserving a urethral opening and anal opening.

Urethra:

The urethral opening is flush with the skin. So if there was a penis, the urethra is shortened to the base of the pre-existing penis. If there was originally a vagina, the skin edges meet the original urethral opening.

Original with Penis: penis, both testes and scrotum removed.

Original with Vagina: vagina, clitoris and labia removed.