As a man who once shaved his entire body just for kicks, I really should write a book about all the things I’ve done just for kicks. I think I might be the one you come to for such a question. That said, shaving that region is best done in the shower, after the area is well moisturized from plenty of water falling down on it, and shave with the hair growth, not against it. Use a quality shaving cream, and be gentle. It sometimes takes several shaving episodes to get it the way you want. Electric razor? Yeoouch! That will just yank the hairs out, not a good idea.
Oh and by the way, never shave your ass, the stubble coming back in will make sitting down very uncomfortable.