Reproductive behavior and sexual intercourse vary among different organisms. In animals, there are many mating systems such as monogamy, polygyny, polygamy, promiscuity, and polyandry. Some of the mating behavior are reproductively motivated while others are non-reproductively motivated. Copulation often occurs in the most fertile period in animals including humans. This is to increase reproductive success. Few animals also involve in a fight during their fertile phase to select the right partner to mate. Females choose males that are strong and have to ability to protect the young ones as their partner. Intercourse is the way of inheritance or passing of genetic material to the next generation.
Most non-human mammals undergo intercourse through vaginal copulation. This happens when the male mounts on top of the female. The female animals involved in copulation usually curve back ventrally to allow the infiltration of the male reproductive organs. This process is named lordosis. Among the land animals, bonobos have face-to-face mating behavior because of the female’s anatomy. However, the ventri-ventral coitus process is also observed in species like Rhabdomys. Certain marine mammals undergo intercourse in the belly-to-belly position where the rubbing movement can transfer the sperm into the female. The distinct characteristics of all mammals are that the ejaculation of the sperm only happens after numerous intromissions. However, in primates, the coitus happens in single short intromission. Certain ruminant species require a pelvic thrust during coitus to push the sperm inside the female. Animals like deer require copulatory jump. There are different terms like a copulatory lock or copulatory tie in mammals like canids, martens, and senegalensis. Sperm competition is observed to affect the copulatory behavior of many mammals. Some females also exhibit concealed fertility that can result in difficulty for a male to evaluate the compatibility of the female.
Some animals like sheep and birds take part in intercourse only during a particular season. This is named as breeding season. Certain hormones are secreted during this phase in both male and the female. In non-breeding species, the level of these hormones drops leading to the decreased desire of these animals for copulation.
Humans:
The reproductive act of the human is similar to other organisms where the male transfers his sperms into the female to bring about fertilization. Intercourse is successful if there is a formation of zygote inside the female. However, in some animals, eggs are laid outside the body surface. Internal copulation only occurs in certain organisms including humans that are complex and have suitable adaptations. In humans, excretory and reproductive functions are both provided by the male. During coitus, the blood flow is increased in the penis of the male which results in it becoming swollen and erect. Under normal conditions, the penis is a flaccid and soft organ. However, upon sexual stimulus, it becomes larger and rigid to penetrate the female genitalia. During the process, the male ejects semen which is a fluid-containing numerous sperm. These sperms travel through the female reproductive tract and combine with the egg to fertilize it. The seminal fluid usually contains all the nutrients, electrolytes, and water to sustain the sperms. Simultaneously, the vagina of the female prepares itself for the arrival of the sperm by lubricating the inner surface. There are plenty of hormones behind the ability of males and females to secrete respective fluids while they are sexually active. The female reproductive system consists of the uterus which carries the young ones. The vagina extends into the uterus which is a thick-walled pear-like organ. This organ allows the sperm to enter and fertilize the eggs. Upon successful fertilization, the zygote attaches to the walls of the uterus and develops into a fetus.The pattern of sexual intercourse in humans involves four stages such as excitement, plateau, orgasm, and finally resolution. This pattern is common in both male and the female irrespective of the sexual stimulus.
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