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If sperm competition results in the rival male's sperm fertilising the egg, cuckoldry could occur. This is the process whereby males unwittingly invest their resources into offspring of another male and, evolutionarily speaking, should be avoided. [33] The most researched human penis adaptations are penis size and semen displacement. [34]
Date/Time Thumbnail Dimensions User Comment; current: 08:41, 5 September 2010: 4,320 × 3,240 (4.63 MB): 1995k80 {{Information |Description={{en|1=this is a picture of a penis in a erect state.the penis is from a uncut male and is about 7 inches long}} |Source={{own}} |Author=1995k80 |Date=2010-08-02 |Permission=none |other_versions=no }} [[Categor
English: Real-time demonstration of the complete erectile process of the human penis. The subject is a 27-year-old healthy circumcised Caucasian male. At the beginning of the video, his penis is flaccid (non-aroused, soft, and fully flexible).
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