If they impregnated themselves, it would be the saem genes, so evolution or adaptation could not occur. It may do it to boost numbers in more harsh conditions. But mating between two seperate individuals is much more beneficial for a species. Slugs have both male and female organs, but still need to get together.
The "Mucnh the heart" image was used as a chapter in The Official oddworld Art book, explaining how Munch was designed wtih large eyes and under a predicment to make Munch appealing to people for those reasons.
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