When my hubby and I are on different sleeping schedules, I notice he usually has quite a few erections throughout the night up until he wakes up. It doesn't seem to matter if he has peed right before he went to bed or not. Plus, he doesn't always have to pee when he wakes up (when he hasn't drank enough water the day before, tsk tsk) so maybe it's different for different guys. hmm
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