In 2010, entomologist Charles Linehard described Neotrogla, a new genus of barkflies. Species of this genus have sex-reversed genitalia. Females have penis-like organs called gynosomes that are inserted into vagina-like openings of males during mating. [143] In 2014, a detailed study of the insects reproductive habits led by Kazunori Yoshizawae confirmed that the organ functions similar to a penis – for example, it swells during sexual intercourse – and is used to extract sperm from the male. [144] [145] Mollusks Rietstap, J. B. (1884). "Armorial général; précédé d'un Dictionnaire des termes du blason". G. B. van Goor zonen: XXXI. Vilené: se dit un animal qui a la marque du sexe d'un autre émail que le corps {{ cite journal}}: Cite journal requires |journal= ( help)

The scrotum is super sensitive, so any hitting or twisting is extremely painful. But many people like having their scrotum gently touched during sex.Lilia, K.; Rosnina, Y.; Abd Wahid, H.; Zahari, Z. Z.; Abraham, M. (2010). "Gross Anatomy and Ultrasonographic Images of the Reproductive System of the Malayan Tapir (Tapirus indicus)" (PDF). Anatomia, Histologia, Embryologia. 39 (6): 569–575. doi: 10.1111/j.1439-0264.2010.01030.x. PMID 20809915. S2CID 46441225. Barry, R.E.; Shoshani, J. (2000). " Heterohyrax brucei". Mammalian Species. 645: 1–7. doi: 10.1644/1545-1410(2000)645<0001:hb>2.0.co;2. S2CID 28256848. Michael L. Augee; Brett A. Gooden; Anne Musser (January 2006). Echidna: Extraordinary Egg-laying Mammal. Csiro Publishing. ISBN 978-0-643-09204-4. Archived from the original on 26 March 2014 . Retrieved 23 July 2013. The anus (AKA butthole) is the opening to your rectum. The anus has lots of sensitive nerve endings, so some people experience sexual pleasure from anal stimulation.

This suggests that the penis appears shorter when there is more fat under the skin at the visible base of the penis. Weight loss can often resolve this. The human penis is an external sex organ of male humans. It is a reproductive, intromittent organ that additionally serves as the urinal duct. The main parts are the root of the penis (radix): It is the attached part, consisting of the bulb of penis in the middle and the crus of penis, one on either side of the bulb; the body of the penis (corpus); and the epithelium of the penis consists of the shaft skin, the foreskin, and the preputial mucosa on the inside of the foreskin and covering the glans penis. Measurements vary, with studies that rely on self-measurement reporting a significantly higher average than those with a health professional measuring. As of 2015 [update], a systematic review of 15,521 men, who were measured by health professionals rather than themselves, concluded that the average length of an erect human penis is 13.12cm (5.17 inches) long, while the average circumference of an erect human penis is 11.66cm (4.59 inches). [2] A 1996 study of flaccid length found a mean of 3.5 inches (8.9cm) when measured by staff. [3] Flaccid penis length can sometimes be a poor predictor of erect length. An adult penis that is abnormally small but otherwise normally formed is referred to in medicine as a micropenis, with the cutoff usually being defined as around 3 inches (7.6 cm). A human penis, flaccid and erect. Flaccid length is a poor predictor for erect length.Nikoobakht M, et al. (2010). Effect of penile-extender device in increasing penile size in men with shortened penis: preliminary results.