Alex thought about what he could do. He didn't really want to get rid of either part, he liked the fact that both dicks and vaginas existed. And changing human bodies felt very wrong in many ways.
He thought that mabye instead he could just change where the human reproductive system would come from. It was subtle enough so that most people wouldn't be that effected, but it was certainly something he would be able to have some "fun" with.
Now. He just had to brainstorm what exactly he had to do. And also probably do the work of figuring out the exact details of how to operate the device properly.
He finally thought of something good...