A sub or slave should groom as their DOM prefers.Personally I prefer trimmed with clippers to about ¼ inch. Keeps it natural looking but also easy to keep clean etc.
Much prefer seeing shaved genitals, male or female. For myself, don't mind being shaved where not obvious but don't want my spouse asking questions if she sees area above genitals shaved.
Both wife and I used to completely shave but this year the wife decided to let it grow out full. It adds to our dynamic and her full bush seems mature and dominant against my shave cock. We typically only do oral (she receiving from me) and that has changed things as well now that I get a face full of hair every time I go down.
In the past when I had a dominant hairy chested boyfriend, he would shave my genitals and blonde haired bottom on a regular basis. In order to train me to be submissive to him, he would have me only wear a white t-shirt that was cut short and hung down from my neck to my naval. My shaved genitals and smooth bottom were thus on display when I was inside his house or outside in his back yard that had a high fence for privacy. I did feel more submissive due to the shaved genitals and smooth bottom.
I'm more of a spankee than an out and out sub but that does mean I have to submit to my punisher and accept their authority. I understand that I will be fully exposed during my punishment so, if my punisher expresses a preference, I will present myself as instructed. It's possible I might be getting my first punishment for some time next month - if that happens, I will have to be hairless from the waist down.