I have always thought that being with someone who is both a male and a female would be enticingly erotic.  While in the Navy, I had a chance to come face-to-face with a shemale in Spain, but in my innocent state-of-mind, did nothing about it.

Today, I regret not having that experience.

It would be nice to know what others think or may have experienced, either from a solo standpoint or with your spouse.