Changing the discussion just a little: Assuming, as always, that proper hygene is always observed, that the person's body, face, etc. is freshly showered or bathed, where and how should scent be applied?
This assumes that there would be no concerns about "strange" scent being noticed by SO.
Of course, when in doubt, use less -- a lot less. Less is better, IMHO.
If one is to use any cologne or perfume during a session, is there any reason/benefit/enjoyment for application to "private" areas?
Not done that myself, and don't recall fragrance during DATY, for instance, but just curious about opinions.