How do I avoid pain in the testicles while riding horses?

Today was my second horse riding lesson and, I don't know if other Male riders also experience the same thing but while I'm riding and when the horse starts running i feel pain the testicles because my legs and balls hit the saddle, I mean is this dangerous? It's not extreme pain but I'm just worried, people back then rode horses everyday for long distances so there must be a way to avoid it.
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