Hi I am planning a MMF threesome with my DP....and also considering trying the other kind of DP (ahem)
This is the No 1 favourite sexual fantasy of both myself and himself.
We have previously enjoyed a foursome with a couple I know and in fact we have both previously had threesome experiences before we met each other. He has suggested that we could try a MMF threesome with a friend of his from overseas, when the chap comes to visit. I very much like this idea
as I have wanted to try it for years 
So the desire is mutual, we are both comfortable with the idea, no one is pressuring the other etc etc. In fact the foursome we did together was pretty amazing and made us closer, as its something we both have a mutual interest in and neither of us have had a relationship before, where the other partner actually shared our taste for this kind of thing.
Can anyone tell me about their experience of MMF and in particular, has anyone tried and achieved double penetration? I really want to try this but am interested to know what it "feels like" physically before I take the errr plunge so to speak. I can do the MMF experience with or without trying DP, as its up to me, but want to find a bit more about the mechanics of it before I do so.
Thanks