How do reptiles mate?
Most reptiles mating is similar to mammals, there are some lizard species that reproduce by parthenogenesis, that is they produce both sperm and egg and do not have a need for male & female. Research being done at this time seems to provide evedence that some other reptiles may reproduce this way also.
Higher animals, reptiles, and mammals mate because they have two genders. Fish, however, almost always fertilize their eggs after they have been laid. Mating is an adaptation for the perpetuation of species. Sexual division increases the genetic variations. Plants also have sexual reproduction, but do not technically "mate". Some animals reproduce asexually so they can produce offspring without mating. Animals such as the hydra can reproduce asexually by budding, producing a clone of itself.
Birds don't have typical sex organs. Like fish and reptiles, males and females alike have a single opening for reproduction and waste elimination. Males accumulate sperm in semen near this opening, known as a cloaca. When birds mate they simply touch cloacae, transferring sperm to the female. This only takes seconds, but can happen hundreds of times a day.
Yes. All vertebrates (mammals, birds, fish, reptiles and amphibians) mate. Platypus mating rituals involve the male chasing the female around in a circle. They have a complex system of side-passing, under-passing and over-passing each other, until the male finally grasps the female's tail in his bill, and they continue circling tightly until mating occurs.