persistent, usually painful erection of the penis, especially as a consequence of disease and not related to sexual arousal.
What it does: Prolactin relieves sexual arousal after orgasm and takes your mind off sex.
"In sexual arousal, Blood fills spaces in the tissue, and Blood vessels constrict to hold it there, enlarging and hardening the penis in an erection. The foreskin, a circular fold of skin covering the glans, is often removed. "
The displacement of sexual arousal or gratification to a fetish.
It is essential to your libido and sexual arousal.
