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I am studying parthenogenic snails, they end up going sexual because of vulnerability to parasites, evolution in action people.
 
^ Is that considered voluntary or involuntary behavior? The parthenogenesis I mean.
 
It's involuntary, in so far as the females don't actively choose a mode of reproduction, it's a function of differential survival.

The asexual reproductive mode dominates when a single female has colonised a marsh or oxbow lake, but in time the proportion of sexual reproduction increases because parasites render the asexual forms sterile.

The ones I'm looking at are a little bit old though, 110 million years ;)
 
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