Actually, a human male has the largest proportional genitals of most species.

but inch for inch...

and is it species or just primates? I know the human male has the lagrest phallace, simply because of the fact that we walk upright so it has to be longer in order to reach because the woman's vagina isnt behind her anymore, it's underneith. Also Chimps have the largest testies of all primates because they are the most promiscuous

lol i remeber this