Why hermaphrodites?

Factual Questions
21

[QUOTE=Colibri]
Why sex itself exists is pretty well understood: the shuffling of genetic combinations produced by sexual reproduction enables species to adjust to changing conditions.
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How’s the evidence looking for the hypothesis that the big usefulness of sex is to thwart parasites?

22

[QUOTE=chorpler]
How’s the evidence looking for the hypothesis that the big usefulness of sex is to thwart parasites?
[/QUOTE]

I don’t follow the literature that closely to say in detail, but that’s certainly one of the potential advantages.