Conjoinment

Some people would call it a disability, but there was something extremely sexy and intimate about two people sharing a body. He had fantasies about being joined to a beautiful woman, or laying with a woman with two heads. There were just so many options out in front of him that he (nor his pants) could barely contain himself... He wanted it now. The only question now was who to join together?

If he does it to himself, he'll have to share the power of the wishing wand.
If he does it to other people, he won't know what it's like, but he can keep the wand to himself.