Are Duo's better?

[phunbill]

Just an observation really, I have been with a few duets, having been with one of the girls on a previous occasion.
Like: 2 weeks ago I had a session with a really great girl, it was hard to imagine that it could have been any better.
After the session she suggested that I might like to come back for a duo session with her and her friend. last week I met the two of them, and while it was good, I was a little disappointed. One girl on her own will put in effort and often passion. But when there is two girls, they seem to get inhibited.
I have noticed this a few times over the years.

Has anyone else experienced the same?
And what do the girls think?