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Talk about clingy! A newly discovered cave insect can copulate for up to 70 hours, possibly because the female has a "penis-like" sexual organ that penetrates deeply into her male partner, anchoring him for the duration, scientists say.
I think I hooked up with her once. Not that she had a penis like organ, but she latched on and I think at one point I could have left her alone in my apartment and she wouldn't have known the difference.