Penis fencing
5580754
222340715
2008-06-28T20:40:41Z
207.237.2.80
[[WP:UNDO|Undid]] revision 222340588 by [[Special:Contributions/207.237.2.80|207.237.2.80]] ([[User talk:207.237.2.80|talk]])
{{for|the human sexual behavior|Frot}}
<!-- Deleted image removed: [[Image:Penis fencing insemination.jpg|right|frame|Two [[flatworm]]s of the species ''[[Pseudobiceros hancockanus]]'' penis fencing. The one on the left has [[insemination|inseminated]] the one on the right. The sperm (shown in white) is absorbed through pores on the skin, thus causing fertilization|{{deletable image-caption|1=Thursday, 20 March 2008}}]] -->
'''Penis fencing''' is a [[mating]] [[animal behavior|behavior]] engaged in by certain species of [[flatworm]], such as ''[[Pseudobiceros hancockanus]]''. Species which engage in the practice are [[hermaphrodite|hermaphroditic]], possessing both eggs and sperm-producing [[testes]].<ref>{{cite web |url=http://www.pbs.org/kcet/shapeoflife/episodes/hunt_explo2.html |title=Fighting to mate: flatworm penis fencing |author=Leslie Newman |publisher=[[Public Broadcasting Service|PBS]]}}</ref>
Child-bearing, while necessary for the continuation of a species, requires considerable resources from the mother. Thus, from a biological point of view, it is preferable to be the father rather than the mother.
The species "[[fencing|fence]]" using two-headed [[dagger]]-like penises which are pointed, and white in color. The "winner" is the organism that inseminates the other. The sperm is absorbed through pores in the skin, causing fertilization in the "loser".
==Other uses==
The term also applies to homosexual activity between two male [[bonobo]]s.<ref>[http://primate.uchicago.edu/DeWaalSciAm.doc Bonobo Sex and Society], by: de Waal, Frans B.M., ''[[Scientific American]]'', 00368733, Mar95, Vol. 272, Issue 3 (Word document) "They also practice so-called penis-fencing, in which two males hang face to face from a branch while rubbing their erect penises together."</ref>
==References==
{{reflist}}
==External links==
* [http://www.pbs.org/kcet/shapeoflife/episodes/hunt_explo2.html Fighting to Mate - Flatworm Penis Fencing (pbs.org)]
[[Category:Mating]]
{{biology-stub}}
[[id:anggar penis]]