Final answer:
The compressor urethrae is the urogenital muscle found solely in females, aiding in the control of urination by compressing the urethra.
Step-by-step explanation:
The urogenital muscle that is only found in females is the compressor urethrae. This muscle is part of the deep perineal muscles and plays a crucial role in the female urinary system. It facilitates the compression of the urethra to retain urine. This muscle, along with the sphincter urethrovaginalis, helps to close the vagina. These muscles differ from those found in the male perineum, like the deep transverse perineal muscle, which is associated with ejaculation in males.