Okay, this just in!
I heard today that when a girl's on her period she passes a hormone( don't know what hormone) but the penis can sense this and gets hard because of that. Is this true?!
I think it's a load of BS!
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Vaginal Hormone
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In a dog maybe! A bitch in heat will bring in dogs for MILES!Women have hidden ovulation, unlike many other animals. Guys just can't sense that. Besides, haven't we talked about PMS around here enough, how many men really want to be around when their girl starts? LOL
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Are you thinking about Pheromones?
Human pheromones
A few well-controlled scientific studies have been published suggesting the possibility of pheromones in humans. The best-studied case involves the synchronization of menstrual cycles among women based on unconscious odor cues (the so called McClintock effect, named after the primary investigator). This study proposes that there are two types of pheromone involved: "One, produced prior to ovulation, shortens the ovarian cycle; and the second, produced just at ovulation, lengthens the cycle". -
Don't think it's a pheromone. I'll go with Pepsi on this! It's Hidden!