Of course. For many reasons, most of which are easily assumed. I would have sex with a feminine shemale, and if I did meet a RL herm, especially with both reproductive tracts functional, I would do everything humanly possible to keep her.
Maybe also get a normal girl. So that your penis goes in the futa's whatever she has and the futa's penis goes into the girl. Even that sounds a really wrong in real life. In hentai however, that's a separate story.
Considering that I'm bisexual, the answer is yes. o_O I've dated people who were in the middle of a sex change anyway - I don't care about the inbetween stages and I like both genders, so I care more about what's on the inside. That the outside is a bit different just means there's more to try out. FOR SCIENCE.