Several of my wife's sexual fantasies really emphasize the 'fantasy' part. As in physically impossible:
1) Mind control: most of her favorite porn involves some form or another of mind control, the ultimate form of submission, doubly so because the subject can be made to love what they are doing. Needless to say, unless someone knows someone at some secret lab, I don't think this one is doable.
2) Tentacle porn: She loves that staple of Japanese animation. Again, lose of control, "I shouldn't like this, but it feels so good."
But there are some others that we're trying to explore.
3) Having sex or masturbating in room with one-way mirrors. People can see her but she can't see them. Similarly, we've talked about using a blindfold in a similar situation. It is why she loves having sex in front of an open window where people might see us from a distance. She's always excited and scared of being caught.
4) The ultimate fantasy has to be a performance at a swingers club, involving her putting on a show for me on the dance floor and ends with me fucking her in front of club, as she cums loudly in front of everyone like the dirty, dirty girl she is
