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Male dogs have a conspicuous penis sheath. [8] Penile sheath of a Chihuahua with cryptorchidism. In stallions, the retractor penis muscle contracts to retract the stallion's penis into the sheath and relaxes to allow the penis to extend from the sheath. [9] The penis sheath of a male axis deer is elongated and urine-stained.
A notable difference from the human penis is that the visible part during an erection consists entirely of the glans. The retractor muscle is attached at the shaft of the penis. It is a paired smooth muscle that is used to retract the penis back into the sheath.
The retractor penis muscle occurs in marsupials and carnivorans, but it is absent in humans. [1] A stag's penis forms an S-shaped curve when it is not erect, and is retracted into its preputial sheath by the retractor penis muscle. [2] In Tandonia, the retractor penis inserts at the boundary between the penis and epiphallus. [3]
For domestic dogs the tie may last up to half an hour or more, though usually less. [7] When male canines are sexually excited, the bulbus glandis may swell up inside the penile sheath, even if the dog has been neutered. [8] The bulbus glandis also occurs in the penises of some pinnipeds, including South American fur seals. [9]
Cryptorchidism can be either bilateral (causing sterility) or unilateral, and inguinal or abdominal (or both). Because it is an inherited trait, affected dogs should not be bred and should be castrated. The parents should be considered carriers of the defect and a breeder should thoughtfully consider whether to breed the carrier parent or not.
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A notable example of a bird with a pseudo-penis is the red-billed buffalo weaver, which do not use their pseudo-penis for direct insertion during copulation; however it does play a part in successful mating and stimulation. [15] Similarly to the red-billed buffalo weaver, the cassowary, a ratite, exhibits a pseudo-penis in both males and females.
English: In this video is demonstrated how a foreskin of an uncircumcised penis glides over the glans penis during masturbation. The video is taken from different angles. The male (age 35) seen in this video moves his foreskin back and forth over his erect glans penis by three fingers or by whole hand, no lubricant is used.