I do all my own grooming and I do a sanitary trim on all my dogs!! I use an Oster Trimmer with a 40 blade and cut all the tan hair near the little poop hole

and then I do a trim down the inside of their legs just a little bit. I only cut the tan hair in an upside down U shape and hold up or clip up all the black hair, so my long coated babies still look correct, you can't tell I have done a privates trim. FYI, I do let the hair grow a little long on their little peepee parts, whether girl or boy because that extra hair is like a spout and it lets the pee travel down it and doesn't end up on their belly or the inside of their legs!! I know it is probably TMI!!