I have always wonder about this too. I have heard some people claim they do or that you can, but on the opposite I have heard it is purely feelings and psychological on the magicians part. I have heard that demons enjoy sexual energy and I have heard they have no need for the base desires that humans have. So I am also curious about this as well.
I moved this reply from the Q&A section, to keep that tidier & also open it up for general discussion.