As it should be, in my opinion. One of the benefits, especially if you're a kicker, is it teaches you to protect your groin.
In your organization are you allowed to drop kick? (slide to the floor under the opponents space and side kick up to the groin) I scored a boatload of points that way. Especially against aerial kickers.
I used to tell my students "If you want to see how open you are when kicking, when you get out of the shower go stand in front of a full length mirror and slowly throw a high kick. That's how open you are."
I pretty sure it's allowed to.