Mmm...got a whiff of his cologne? Did he just take his shirt off at the gym? Did you start to feel a little tingly...down there? Perhaps a bit moist? And almost like your clitoris is standing 6 feet tall? Well girl, you've just suffered from a vaginal erection.
I was sitting at my desk and when he walked by I smelled his cologne. I had to run to the bathroom after I realized I'd just had a vaginal erection.