I'll assume not many MPA's are going to chime in (maybe Crystal, Lizz, and one or 2 others).
From what I've been told though, by MPA's themselves, they prefer:
- balls and shaft need to be shaved. Feels better when massaging the boys. Bodyslides are better as it's skin on skin. If you go someplace where a little Teabagging is on the menu then they don't get hairs in their mouths. Also allows for inspection for anything that doesn't look right and would cause her to end the seesion right then and there (STD's).
- pelvis should be at least trimmed if not shaved. Free bush is a no-no unless she has free bush herself which is rare.
- "There's a Shower, so Use It" rule. Even if a guy showered before coming to the spa give a quick rinse to the anus and taint to get rid of any smell as this is the area (other than the armpits) that will give off the worst smells
- Deodarant is required and a not too powerful cologne can turn an MPA on.
- Brush your teeth, use a mouthwash of some kind of breath freshining mints or gum is a must as well.
- I think women like circumsized better. It's a cleaner look.
Look clean, smell clean, be clean and you get a better session.
This is old but should answer some of your questions.
http://www.massageplanet.net.ca/vbulletin/showthread.php?t=5860&highlight=clean+smell