Is there any advantage to penises and vaginas being so close to the end of the digestive tract? Why does the penis double up to extract waste and make babies?
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[gastropods](https://en.wikipedia.org/wiki/Gastropoda) have their gonads near their heads. Most vertebrates give birth to either large eggs or live offspring. They have to carry the fetus or egg inside them until they are developed enough to not die which means they need to be relatively large compared to the size of the adults and somewhere that’s protected. That pretty much limits the location to inside the lower abdomen. If it was in the chest cavity breathing would be an issue, especially during birth.
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