1. when two bonobo apes frot
2. when two flatworms mate, each one trying to thrust its penis into the other one in order to impregnate it
penis fencing, it fencing with penises
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A person who sits on the proverbial "penis fence" is a feminine male who people often have debates about whether they are homosexual or not.
Bro, it's amazing that Scott has a wife and kid but yet has sat on the proverbial "penis fence" his entire life.