Not sure if this has been posted before - apols if so. A long (long - 291 posts) thread on pulling back http://www.topix.com/forum/news/sex/T25SQHO0N5V5RC8C3 (http://www.topix.com/forum/news/sex/T25SQHO0N5V5RC8C3); original post June 2010, and its still active - last post 7 Sept this year. Much pro, several anti, but interesting reading.
Two later posts are interesting (my emphases):
#287, from a UK woman:
My boyfriend has a bare penis head. The skin is quite loose so I think it's probably retracted rather than circumcised but we've never really discussed it. I've come across guys like this before, I think it's quite common. I prefer it to skin covering the head.
and #288, reply from another UK woman:
You're right, it's not unusual, many of the guys I've known just leave it uncovered like a loose circumcision. I think that if the skin is already ice and loose at puberty, as their penis grows bigger boys often just let the skin roll back.