Unexpected mage?

I received my first swedish mage last week and it went a little strange. The mgae therapist recomended that I be nude under the draping which wasn't a big deal being that it is common. What I felt was awkward was that about midway through the mage while lying on my stomach, he lifted the draping all the way up to the small of my back leaving my behind completely exposed. He then "really" mages my behind for a good five minutes. It did feel very good but they way he was doing it and the time he spent there made it seem unusual. I didn't say anything not knowing what to expect. Other than that it went well. Thoughts?