Produce a secretion which forms the bulk of the semen. This fluid is rich in citrate, fructose and hyaluronidase enzyme Citrate and fructose are utilised as fuels by the spermatozoa within the vagina and hyaluronidase splits mucopolysaccharide so that the mucus plug within the cervical canal of uterine cervix-can be penetrated by spermatozoa.