In humans , the anus from Latin anus meaning "ring", "circle"   is the external opening of the rectum. Two sphincters control the exit of feces from the body during an act of defecation , which is the primary function of the anus. These are the internal anal sphincter and the external anal sphincter , which are circular muscles that normally maintain constriction of the orifice and which relaxes as required by normal physiological functioning. The inner sphincter is involuntary and the outer is voluntary. It is located behind the perineum which is located behind the vagina or scrotum.
What Makes a Penis Attractive to Women? Science Explains | Fatherly
The male body holds many mysteries. Why are guys always scratching their balls? What exactly is a foreskin supposed to do? Why do flaccid penises look so ridiculous? But the most pressing questions we have concern semen—also known as ejaculate, spunk, and by a host of less printable nicknames.
The human penis is an external male intromittent organ that additionally serves as the urinal duct. The main parts are the root radix ; the body corpus ; and the epithelium of the penis including the shaft skin and the foreskin prepuce covering the glans penis. The body of the penis is made up of three columns of tissue : two corpora cavernosa on the dorsal side and corpus spongiosum between them on the ventral side. The human male urethra passes through the prostate gland , where it is joined by the ejaculatory duct , and then through the penis.
Last Updated: January 21, References Approved. This article was co-authored by Jennifer Butt, MD. She is affiliated with Lenox Hill Hospital. She then completed her residency in obstetrics and gynecology at Robert Wood Johnson University Hospital.