The penis is primarily part of the Reproductive System but is also part of the Urinary System because the penis has two primary functions.
The genitourinary system.
The digestive system contains the liver.
Circulatory System
skeletal system
Digestive system.
the digestive system
The olfactory system.
Circulatory System.
the muscular system
The endocrine system.
lymphatic system.
The eye contains the Retina