I usually get undressed quite slowly so the ML comes in before I finish and at that point I ask if they would prefer I remove my underwear or leave it on also get to see their reaction and work out if part 2 is an option. Have had the ML apologise and seem embarrassed she interrupted leave then come back , was a legit place but most times they stay and prepare for the massage
Have had a few that stay in the room the whole time and watch me get ready, this is the best