Razor Bumps Down There

So, I've always had pretty sensitive skin, especially down there, but I really prefer the smoothness of being shaved (or at least mostly shaved). Unfortunately, shaving gives me terrible, itchy razor burn, which is super uncomfortable, and even sort of embarrassing when my SO wants to go down on me or we have sex. I'm always sure to use and sharp razor and to moisturize down there to reduce the risk, but it happens anyways. Any advice as to how to keep razor burn away?