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The following are based on anecdotal reports. Remember, research on penis stretching techniques is limited. Always talk with a doctor or other healthcare professional before trying a new technique. Stretching exercises Horwich, Robert H. (June 1972). The ontogeny of social behavior in the gray squirrel (Sciurus carolinensis). P. Parey. ISBN 978-3-489-68036-9 . Retrieved 23 July 2013.

Equine Research (2004). Horse Conformation: Structure, Soundness, and Performance. Lyons Press. ISBN 978-1-59228-487-0. Archived from the original on 7 July 2014 . Retrieved 23 July 2013.Gontero P, et al. (2009). A pilot phase-II prospective study to test the 'efficacy' and tolerability of a penile-extender device in the treatment of 'short penis.'

Daniel W. Gade (1999). Nature & Culture in the Andes. Univ of Wisconsin Press. pp.125–. ISBN 978-0-299-16124-8. Archived from the original on 28 May 2013 . Retrieved 4 March 2013. John A. Byers (1997). American Pronghorn: Social Adaptations and the Ghosts of Predators Past. University of Chicago Press. ISBN 978-0-226-08699-6. Archived from the original on 1 January 2014 . Retrieved 15 July 2013. Take the penis pump, for example. A penis pump is a cylinder-shaped, air-filled chamber that you attach to your pelvic area. They’re known to produce an immediate erection. Some anecdotes also claim that consistent use can eventually increase your penis length. a b Dixson, AF (1989). "Sexual Selection, Genital Morphology, and Copulatory Behavior in Male Galagos". International Journal of Primatology. 1. 10: 47–55. doi: 10.1007/bf02735703. S2CID 1129069. 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

Charles A. Long (2008). The Wild Mammals of Wisconsin. Pensoft Publishers. p.341. ISBN 978-954-642-313-9. Archived from the original on 26 March 2014 . Retrieved 23 July 2013. Vidyadaran, M. K.; etal. (1999). "Male genital organs and accessory glands of the lesser mouse deer, Tragulus javanicus" (PDF). Journal of Mammalogy. 80 (1): 199–204. doi: 10.2307/1383219. JSTOR 1383219.

The penises of even-toed ungulates are curved in an S-shape when not erect. [20] In bulls, rams and boars, the sigmoid flexure of the penis straightens out during erection. [21]Boners happen by way of blood flow and that blood carries oxygen to you penis that helps keep it in shape. Research on penis stretching techniques is limited. None of the studies that have been done point to any one technique as an effective way to permanently lengthen the penis. However, a temporary increase in size may be possible. Hoffmeister, Donald F. (2002). Mammals of Illinois. University of Illinois Press. ISBN 978-0-252-07083-9 . Retrieved 22 July 2013. König, Horst Erich; Liebich, Hans-Georg (2007). Veterinary Anatomy of Domestic Mammals: Textbook and Atlas. Schattauer Verlag. ISBN 978-3-7945-2485-3 . Retrieved 23 July 2013.