The pudendal plexus lies behind the arcuate pubic ligament and the lower part of the pubic symphysis

Pubic symphysis

The pubic symphysis or symphysis pubis is the midline cartilaginous joint uniting the superior rami of the left and right pubic bones. It is located anterior to the urinary bladder and superior to the external genitalia; for females it is above the vulva and for males it is above the penis...

, and in front of the bladder

Urinary bladder

The urinary bladder is the organ that collects urine excreted by the kidneys before disposal by urination. A hollow muscular, and distensible organ, the bladder sits on the pelvic floor...

 and prostate

Prostate

The prostate is a compound tubuloalveolar exocrine gland of the male reproductive system in most mammals....

. Its chief tributary is the deep dorsal vein of the penis

Deep dorsal vein of the penis

The deep dorsal vein of the penis lies beneath the deep fascia of the penis; it receives the blood from the glans penis and corpora cavernosa penis and courses backward in the middle line between the dorsal arteries; near the root of the penis it passes between the two parts of the suspensory...

, but it also receives branches from the front of the bladder and prostate. It communicates with the vesical plexus

Vesical plexus

The Vesical Plexus arises from the forepart of the pelvic plexus.The nerves composing it are numerous, and contain a large proportion of spinal nerve fibers.They accompany the vesicle arteries, and are distributed to the sides and fundus of the bladder....

 and with the internal pudendal vein and drains into the vesical

Vesical

Vesical refers to the urinary bladder and its relevant and nearby structures and functions, including:* the vesical arteries, which provide the urinary bladder with oxygenated blood** Superior vesical artery*** Middle vesical artery...

 and hypogastric veins.