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Non-human mammal penis
Flaccid or relaxed human penis
Partially engorged or semi-erect penis
The male penis is not under voluntary control and may become enlarged for a number of reasons.
Human penile functions
Process of penile erection
Normal Erect Penis
Distorted Erect Penis
Penises can become distorted by disorders, injury or repeated mild maltreatment, but deformation rarely affects function.
There are many images and videos of masturbation within Wikimedia Commons, of which these are only illustrative samples:
Medical images of human penis
Hirsuties papillaris penis
Hirsuties coronae glandis or "pearly penile papules" is a harmless anatomical variation.
Hypospadias is a birth defect of the penis. The development of the phallus halts, leaving the opening of the urethra under instead of at the top of the penis. The opening can be anywhere from the underside of the glans penis, down the ventral line as far as the top of the scrotum.
This is a condition where the foreskin cannot be fully retracted over the glans penis.
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Other medical images