Bad to ride an uncastrated male horse while menstruating?

A few years ago I was told that an uncastrated male horse will pick up on a female riders period and react in a not so pleasant way, but I didn't think much of it then because I wasn't riding on a regular basis. I've recently been trying to go out more, and I decided it would be good if I could actually... show more A few years ago I was told that an uncastrated male horse will pick up on a female riders period and react in a not so pleasant way, but I didn't think much of it then because I wasn't riding on a regular basis. I've recently been trying to go out more, and I decided it would be good if I could actually know if there's any truth to it.
So... does a horse react at all?
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