All are sphincters of lower genito urinary tract of female except

In males and females, both internal and external urethral sphincters function to inhibit the release of urine. In males, the internal sphincher muscle of urethra functions to prevent reflux of seminal fluids into the male bladder during ejaculation. Females do have a more elaborate external sphincter muscle than males as it is made up of three pas: the sphincter urethrae, urethrovaginal muscle, and the compressor urethrae. Ref - semantischolar.org