Towelettes

Why are towels at the gym so small?  I consider there to be three essentially private areas that I would like to keep covered with a towel when I walk to the shower.  If I can only cover one at time - that makes things difficult for me.  Perhaps that is what they use for motivation around this gym . . . it's probably hanging somewhere on the locker room wall: "Hey, if you lost a few pounds that towel might at least cover two of your three so-called private areas. Best of luck."