Doc sent this article on butterfly promiscuity to me:
Bacteria that kill off male butterflies can actually lead to increased promiscuity in female butterflies, scientists have found.
The Current Biology study looked at the Hypolimnas bolina species, common to the Pacific and SE Asia.
The team discovered as the bacteria caused male populations to fall, females mated more frequently to boost their chances of becoming impregnated.
It sounds as if the females are hedging their bets - a seemingly rational response given their apparent incentives. And what happens to the males?
"Greater numbers of female partners leads to fatigue in males. They start producing smaller sperm packages."