I think I've done 90% of the things on my bucket list over the years. The unexpectedly good ones have been MMF (far higher ratio of good punts to bad than any other form of punting in my experience) and "violence" (never had any interest at all, but then had a fantastic session with a girl who is into choking, scratching, spanking -- seriously being hit -- and the like.) The disappointments have been FFM (complete waste of time and money on all but one of half a dozen occasions) and anal (not unpleasant, but 40 quid extra for old rope.) Things remaining:
1. A tranny (don't know if I ever will...she'd have to be very feminine...but knowing me I'll get there in the end (no pun intended.)
2. Family members (as in sisters, mother/daughter, etc.) I know many wouldn't, but I would. That said, as I've done MMF with married couples, you could argue I already have done this.
3. Mile High Club (because it's there.)
4. Dogging (the idea doesn't particularly turn me on, but it's a box on the list there to be checked so might as well do it once.)
5. A lesbian couple (or bi sexual, but a genuine female couple.) By this, I do NOT mean another boring parlour FFM...I mean an encounter with a proper lady couple who were into each other as well as providing a service.