| Also, males cannot force females to copulate as copulation is only possible when the female assumes a horizontal body posture. |
| Some religious tenets and social conventions ban copulation between unmarried couples or limit coitus to certain postures or positions. |
| Each male possesses two intromittent organs, one on either side of the body, only one of which is everted during a single copulation. |
| The behavioral sequence leading to a copulation has been extensively described in the domestic fowl. |
| Same-sex copulation and bonding are common in hundreds of species, from bonobo apes to gulls. |
| During copulation, the female transfers unfertilized eggs to the male's ventral surface, where fertilization takes place. |
