We've recently been getting horses. Our latest addition is a brown Stallion, who totally and completely refuses to allow women to ride him. He's just fine with my father, me, and any other male, but as soon as my sister/mother/his previous owner saddled him, he'd flip. This normal? Now, he's got two females in his pen, who he seems....*affectionate*...towards... Dunno

Well, unless the "horse riding" you have in mind is different from what 99.999 percent of the world considers a ride, I'd just say that it's the horse's personality. Women smell different than men. They walk differently and use different body language. It could be that whoever trained it did so cruelly and happened to be a member of the 'fairer sex'. Really, there's no way to tell.

his previous owner (a female) can't saddle him without him flipping? heh