SO MAYBE BEDWETTING EVOLVED AS A PROTECTIVE MEASURE? Water is bed bugs’ kryptonite: The parasites avoid wet surfaces at all costs. “‘Bed bugs have extremely flat bodies and small respiratory openings called spiracles on their belly sides. “If they physically contact a body of water, they’ll get stuck to its surface, blocking their respiratory openings,’ Choe said. ‘Due to its strong adhesive power, water could be very dangerous from a bed bug’s perspective. So, it’s not surprising to learn that they’re extremely averse to moisture.'”