NSFW: Fluther, can you help me with an extremely embarassing situation?

Well, as I said, this is an embarasssing situation. I was at my local gym yesterday, and I was the only one using the showers. The assistant manager of the gym knew I was the only one using them. I’ve talked to her many times, so I know her pretty well. Well, she randomly walked in the men’s showers to grab a couple of clean towels, and glanced over where I was showering and said hi from a distance. While I had an erection. I was beyond embarrassed. She just laughed and walked away. Is this normal? Ladies would you ever do this? Or do you think she was sending me a signal?