Just to mention that I eventually tried it twice a couple of years apart, wanting to experience DP for the first time.
The first time the couple seemed fine but most of the time was spent chatting and apart from a little oral there was no sex.
Then another couple were simply lovely but I simply failed and after normal sex I went limp at the entrance to her bum, not to be revived. Presumably second time nerves on my part although I'm no callow youth.
