Personally it’s the silkiness after a fresh wash that gives good mouthfeel, among other ways a good wash contributes to a positive experience. It’s also good to not have any cosmetic products on or directly around the penis or testicles, but the tiniest dab of scent up higher on the inguinal line, like up towards the hips, would be nice. Just not a lot, you want to get any offensive smells off with washing then just add back a little pleasant smell since the face is gonna be right up in there.