Porn sperm from the wall

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Porn sperm from the wall

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Porn sperm from the wall

Porn School girl, rape, organized, cream pie, squirting, Deep Throating, and sample videos Item number: 1nhdtb081 Boss`s daughter had dabbled with the drunken man. The boss sleeps in one wall across the other side! Her to withstand his voice many times Ecstasy spree! More cuttings push students to the wall! In the situation can`t get away. Direct hit from uterine pressure sex! Not dripping cum and ejaculating in the vagina back soon! Dangerous sex attacks the fear of pregnancy STET girls fall!

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As early as 330 BC, Aristotle prescribed the ligation (tying off) of the left testicle in men wishing to have boys. [17] In the Middle Ages, men who wanted a boy sometimes had their left testicle removed. This was because people believed that the right testicle made "boy" sperm and the left made "girl" sperm. [18] One theory about the etymology of the word testis is based on Roman law . The original Latin word testis, "witness", was used in the firmly established legal principle "Testis unus, testis nullus" (one witness [equals] no witness), meaning that testimony by any one person in court was to be disregarded unless corroborated by the testimony of at least another. This led to the common practice of producing two witnesses, bribed to testify the same way in cases of lawsuits with ulterior motives. Since such "witnesses" always came in pairs, the meaning was accordingly extended, often in the diminutive (testiculus, testiculi).[ citation needed ] Another theory says that testis is influenced by a loan translation, from Greek parastatēs "defender (in law), supporter" that is "two glands side by side". [19] In sharks , the testicle on the right side is usually larger, and in many bird and mammal species, the left may be the larger. The primitive jawless fish have only a single testis, located in the midline of the body, although even this forms from the fusion of paired structures in the embryo. [20] In seasonal breeders , the weight of the testes often increases during the breeding season. [21] The testicles of a dromedary camel are 7–10 cm (2.8–3.9 in) long, 4.5 cm (1.8 in) deep and 5 cm (2.0 in) in width. The right testicle is often smaller than the left. [22] The testicles of a male red fox attain their greatest weight in December–February. [23] Spermatogenesis in male golden jackals occurs 10–12 days before the females enter estrus and, during this time, males` testicles triple in weight. [24] The basal condition for mammals is to have internal testes. [25] The testes of the non-boreotherian mammals, such as the monotremes , armadillos , sloths , and elephants , remain within the abdomen.[ not in citation given ] [26] There are also some marsupials with external testes [27] and Boreoeutherian mammals with internal testes, such as the rhinoceros. [28] Cetaceans such as whales and dolphins also have internal testes. [29] As external testes would increase drag in the water they have internal testes which are kept cool by special circulatory systems that cool the arterial blood going to the testes by placing the arteries near veins bringing cooled venous blood from the skin. [30] [31] The testes of the non-boreotherian mammals, such as the monotremes , armadillos , sloths , and elephants , remain within the abdomen.[ not in citation given ] [26] There are also some marsupials with external testes [27] and Boreoeutherian mammals with internal testes, such as the rhinoceros. [28] Cetaceans such as whales and dolphins also have internal testes. [29] As external testes would increase drag in the water they have internal testes which are kept cool by special circulatory systems that cool the arterial blood going to the testes by placing the arteries near veins bringing cooled venous blood from the skin. [30] [31] Boreoeutherian land mammals, the large group of mammals that includes humans, have externalized testes. [32] Their testes function best at temperatures lower than their core body temperature. Their testes are located outside of the body, suspended by the spermatic cord within the scrotum. There are several hypotheses why most boreotherian mammals have external testes which operate best at a temperature that is slightly less than the core body temperature, e.g. that it is stuck with enzymes evolved in a colder temperature due to external testes evolving for different reasons, that the lower temperature of the testes simply is more efficient for sperm production. 1) More efficient. The classic hypothesis is that cooler temperature of the testes allows for more efficient fertile spermatogenesis . In other words, there are no possible enzymes operating at normal core body temperature that are as efficient as the ones evolved, at least none appearing in our evolution so far. The early mammals had lower body temperatures and thus their testes worked efficiently within their body. However it is argued that boreotherian mammals have higher body temperatures than the other mammals and had to develop external testes to keep them cool. It is argued that those mammals with internal testes, such as the monotremes, armadillos, sloths, elephants, and rhinoceroses, have a lower core body temperatures than those mammals with external testes.[ citation needed ] However, the question remains why birds despite having very high core body temperatures have internal testes and did not evolve external testes. [33] It was once theorized that birds used their air sacs to cool the testes internally, but later studies revealed that birds` testes are able to function at core body temperature. [33] Some mammals which have seasonal breeding cycles keep their testes internal until the breeding season at which point their testes descend and increase in size and become external. [34] 2) Irreversible adaptation to sperm competition. It has been suggested that the ancestor of the boreoeutherian mammals was a small mammal that required very large testes (perhaps rather like those of a hamster ) for sperm competition and thus had to place its testes outside the body. [35] This led to enzymes involved in spermatogenesis, spermatogenic DNA polymerase beta and recombinase activities evolving a unique temperature optimum, slightly less than core body temperature. When the boreoeutherian mammals then diversified into forms that were larger and/or did not require intense sperm competition they still produced enzymes that operated best at cooler temperatures and had to keep their testes outside the body. This position is made less parsimonious by the fact that the kangaroo , a non-boreoeutherian mammal, has external testicles. The ancestors of kangaroos might, separately from boreotherian mammals, have also been subject to heavy sperm competition and thus developed external testes, however, kangaroo external testes are suggestive of a possible adaptive function for external testes in large animals. 3) Protection from abdominal cavity pressure changes. One argument for the evolution of external testes is that it protects the testes from abdominal cavity pressure changes caused by jumping and galloping. [36] 4) Protection against DNA damage . Mild, transient scrotal heat stress causes DNA damage, reduced fertility and abnormal embryonic development in mice. [37] DNA strand breaks were found in spermatocytes recovered from testicles subjected to 40 °C or 42 °C for 30 minutes. [37] These findings suggest that the external location of the testicles provides the adaptive benefit of protecting spermatogenic cells from heat-induced DNA damage that could otherwise lead to infertility and germline mutation . Cross section of rabbit testis, photographed in bright field microscopy at 40× magnification. The relative size of testes is often influenced by mating systems . [38] Testicular size as a proportion of body weight varies widely. In the mammalian kingdom, there is a tendency for testicular size to correspond with multiple mates (e.g., harems, polygamy ). Production of testicular output sperm and spermatic fluid is also larger in polygamous animals, possibly a spermatogenic competition for survival. The testes of the right whale are likely to be the largest of any animal, each weighing around 500 kg (1,100 lb). [39] Human testicles are smaller than chimpanzee testicles but larger than gorilla testicles. [41] Under a tough membranous shell called the tunica albuginea , the testis of amniotes , as well as some teleost fish, contains very fine coiled tubes called seminiferous tubules . Amphibians and most fish do not possess seminiferous tubules. Instead, the sperm are produced in spherical structures called sperm ampullae. These are seasonal structures, releasing their contents during the breeding season, and then being reabsorbed by the body. Before the next breeding season, new sperm ampullae begin to form and ripen. The ampullae are otherwise essentially identical to the seminiferous tubules in higher vertebrates , including the same range of cell types. [20] Testicle hanging on cremaster muscle. These are two healthy testicles. Heat causes them to descend, allowing cooling. A healthy scrotum containing normal size testes. The scrotum is in tight condition. The image also shows the texture. The right testis, exposed by laying open the tunica vaginalis.

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