Scientists have determined that the average 13- to 79-year-old penis is erect for about 90 minutes each night, or 20 percent of overall sleep time. With your brain cycling between the four sleep stages, your “sleep-related erections” appear at 85-minute intervals lasting, on average, 25 minutes. (It’s true; they used a stopwatch.)
Tá na Scientific American.
Pode avisar sua namorada/esposa para ficar a vontade. 90 minutos!