How many letters does the top answer for “of or related to the genital and urinary organs or their functions” have?

The most common answer is genitourinary (13 letters).

Crossword clue: of or related to the genital and urinary organs or their functions

2 answers found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

genitourinary 13 letters wn-def

of or related to the genital and urinary organs or their functions

gu 2 letters wn-def

the largest and southernmost island in the Marianas which is administered as a territory of the United States; it was ce