Yes. It's common in spas. Make sure you have a towel around you though...
No, you do not.
You leave your underwear on.
Yes you can be nude for a massage.
You do not have to be nude. And, in fact, it is illegal to be nude during a massage in the US. You may be disrobed, which means having all your cloths off. But, you are covered very professionally with a drape so no private anatomy is exposed.
You leave your underwear on during massage. When I've had a massage I've always been naked.
Generally you are nude, but you can wear underwear, especially for women who are menstruating.
There is no such thing. During a professional massage, you leave on your underwear and you are draped modestly with a sheet and blanket.
In the US, there is no such thing as a nude massage. It is illegal in all 50 states. You must be covered with a sheet or towel and are never nude. You may, however, be completely disrobed and covered with a sheet or towel. That is how most people get their massages. And, we never call it nude, or naked!
Yes , of course.
What do you mean by nude massage? You are expected to LEAVE ON YOUR UNDERWEAR (as in underpants) when you receive a massage. A professional massage therapist will know how to drape you with the sheet/blanket so that only the part of your body being worked on is exposed.
Generally you are nude, but you can wear underwear, especially for women who are menstruating.
Nude massages are mostly common on beaches. I reccommend nude massages; they're very relaxing.