While the capacity to walk upright is not unique to humans, other primates can only achieve this for short periods and at a great expenditure of energy.The human adaption to bipedalism has also affected the location of the bodys center of gravity, the reorganization of internal organs, and the form and biomechanism of the trunk. In humans, the double S-shaped vertebral column acts as a great shock-absorber which shifts the weight from the trunk over the load-bearing surface of the feet. The human legs are exceptionally long and powerful as a result of their exclusive specialization for support and locomotion—in orangutans the leg length is 111% of the trunk; in chimpanzees 128%, and in humans 171%. Many of the legs muscles are also adapted to bipedalism, most substantially the gluteal muscles, the extensors of the knee joint, and the calf muscles. Skeleton
The major bones of the leg are the femur (thigh bone), tibia (shin bone), and adjacent fibula, and these are all long bones. The patella (kneecap) is the sesamoid bone in front of the knee. Most of the leg skeleton has bony prominences and margins that can be palpated and some serve as anatomical landmarks that define the extent of the leg. These landmarks are the anterior superior iliac spine, the greater trochanter, the superior margin of the medial condyle of tibia, and the medial malleolus. Notable exceptions to palpation are the hip joint, and the neck and body, or shaft of the femur.
Sex-advice columnist Dan Savage dismissed the act as completely fictional. Brian Bouldrey in Dirty Words: A Literary Encyclopedia of Sex says the act is an urban legend. The New Partridge Dictionary of Slang and Unconventional English says, "This appears to have been contrived with the intention to provoke shock rather than actually as a practice, although, no doubt, some have or will experiment." Columnist Gustavo Arellano of ¡Ask a Mexican! contends the term evokes the stereotypical mustache of a Mexican. The term for the sex act entered British gay cant Polari in the 1960s.A Chicago sunroof is a fictional act, popularized in American crime drama series Better Call Saul, a spinoff of Breaking Bad. In the series, the titular character Jimmy McGill (Bob Odenkirk) defecates through an open sunroof as part of a revenge plan. As he (falsely) points out, “Its a real thing. I didnt make it up. Im not the first person to do it. Theres a name for it.” Series creator Peter Gould clarified in an interview that the "Chicago sunroof" is not real. See also
2 Girls 1 Cup
Anilingus
Ass to mouth—removing the penis from the passive partners anus followed by its immediate insertion into the mouth
Coprophagia—the consumption of feces
Flatulence fetishism
Sadomasochism
Scatology
Urolagnia (also known as urophilia)—a paraphilia involving sexual pleasure from urine

References
Further reading
Fritscher, Jack (1978). "Review of END PRODUCT: THE FIRST TABOO by Dan Sabbath and Mandel Hall, Preface by Abby Rockefeller. URIZEN BOOKS, N.Y., 1977. 287 pp" (PDF). Drummer. No. 22. Retrieved December 28, 2018. Xavier CM (June 1955). "Coprophilia; a clinical study".