Kinktionary
More like guidelines and a lot less like definitions.
Muse
The muse is a person who is the source of inspiration, passion, artistic creativity, or endeavor for the Artist they are connected to. Whether they are the subject of a poem or song, the "muse" has long been fabled for their position beside their creative companion.
Muses can sometimes be amorous with the Artist, and a sexual and/or romantic arrangement begins via their devoted support.
Not every muse has sex with their Artist, although this can be quite common due to the close proximity and passion.
Muses are often quite artistic and creative themselves, which is likely how their passionate endeavors begin with their Artist.