>>16637764
>promiscuous cultures

Bonobos are known to have relatively large penises compared to their body size. In fact, bonobos have the largest penis-to-body-mass ratio among all the great apes, including humans.
On average, an adult bonobo's penis is approximately 4-5 inches (10-13 cm) in length when erect, which is slightly smaller than the average human penis. However, bonobos are also smaller than humans overall, so their penis size is proportionally larger.
It's worth noting that bonobos are known for their high levels of sexual activity and their use of sex as a form of social bonding and conflict resolution. Their relatively large penis size may be an adaptation for this aspect of their behavior and social structure.

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if human penis really mattered why don't all men have large dicks?