<prompt> Vaginal sphincter is formed by all exceptInternal urethral sphincterExternal urethral sphincterPubovaginalisBulbospongiosus  <response>: Lower genital tract contraction can be carried out by external urethral sphinter, pubo-vaginalis and bulbospongiosus. Females doesnot have internal urethral sphincter.It is anatomical bladder neck sphincter present in males. 