Male to male dating
The clockwise coils are significant because the male phallus everts out of their body in a counter-clockwise spiral; therefore, a clockwise vaginal structure would impede forceful copulation.
Studies have shown that the longer a male's phallus is, the more elaborate the vaginal structures were.
Fossa mating includes a copulatory tie, which may be enforced by the male's spiny penis.
This unusually lengthy mating is due to the physical nature of the male's erect penis, which has backwards-pointing spines along most of its length. abramus is more curved, the shaft and the tip are more robust in P.
As a general rule, a mammal's penis is proportional to its body size, but this varies greatly between species – even between closely related ones.
For example, an adult gorilla's erect penis is about 4 cm (1.5 in) in length; an adult chimpanzee, significantly smaller (in body size) than a gorilla, has a penis size about double that of the gorilla.
In comparison, the human penis is larger than that of any other primate, both in proportion to body size and in absolute terms.
Some mammals have a lot of erectile tissue relative to connective tissue, for example horses.
In most species of animals in which there is an organ that might reasonably be described as a penis, it has no major function other than intromission, or at least conveying the sperm to the female, but in the placental mammals the penis bears the distal part of the urethra, which discharges both urine during urination and semen during copulation.
It is usually partially feathered and in some species features spines and brush-like filaments, and in flaccid state curls up inside the cloaca.
Between male bottlenose dolphins, homosexual behaviour includes rubbing of genitals against each other, which sometimes leads to the males swimming belly to belly, inserting the penis in the other's genital slit and sometimes anus.
During copulation, the spotted hyena inserts his penis through the female's pseudo-penis instead of directly through the vagina, which is blocked by the false scrotum and testes.