Erect Nipples If there is a chill in the air...or even a slight breeze a woman's nipples will become erect...that doesn't signify arousal...men's peni (or is penises correct) on the other hand, when exposed to cold air shrink into obscurity. Lack of Gravity Even with a lack of gravity, a flacid penis is still flacid no matter what direction it's pointing. It's fairly easy to detect a floating flacid penis as apposed to a raging hard on! Ho-hum...next topic please