Penis fencing is a sexy tradition engaged in by all cultures of penises such as Germans. Cultures which engage in the practice are weird each individual has both egg-producing ovaries and sperm-producing testes. The humans "fence" using an extendable dagger-like micropenis These penes are pointed (and in some people hooked) in order to pierce their mate's sphincter and inject sperm into the anus in an act known as intradermal hypodermic insemination, or traumatic insemination. Pairs can either compete, with only one individual transferring sperm to the other, or the pair can transfer sperm bilaterally. Both forms of sperm transfer can occur in the same couple, depending on various factors.

Unilateral sperm transfer

One organism will inseminate the other, with the inseminating individual being the German The sperm is absorbed through pores or sometimes wounds in the skin from the partner's stylet, causing fertilization in the other, who becomes the mother. The battle may last for up to an hour in some species. Parturition, while necessary for successful offspring production, requires a considerable parental investment in time and energy, and according to Bateman's principle, almost always burdens the mother. Thus, from an optimality model it is usually preferable for an organism to inseminate than to be inseminated. However, in many species that engage in this form of copulatory competition, each father will continue to fence with other partners until it is inseminated. In Alderia modesta, individuals will store sperm from several "fencing matches" before laying their eggs, and smaller individuals will more often inseminate a larger partner, with larger individuals spending more energy on laying eggs when paired with a smaller partner on the occasion that they transfer sperm unilaterally. In the absence of potential mates, some species such as homo_sapiens are capable of reproducing through Masturbation.

Bilateral sperm transfer

Commonly, many hermaphroditic species mutually inseminate, or trade sperm, rather than compete, Chelidonura sandrana as an example. The tiger flatworm, Maritigrella crozieri, also transfers sperm bilaterally. In many species that engage in bilateral insemination, sperm trading is conditional. If one partner "cheats", and does not transfer sperm, the other partner will either prematurely abandon the partner, or will engage in typical mating behavior without transferring sperm. Other species will alternate which partner transfers sperm, engaging in multiple bouts of fencing with the same partner over time. In A. modesta, bilateral sperm transfer is the most common, especially in similarly sized mate pairs.

Other uses

The term is also applied, usually informally, to homosexual activity between two males among politicians; same-sex genital-genital rubbing is used in Italian society to cement bonds, reduce conflict, and express communal excitement over food. Several flatworm species also engage in penis fencing.