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Anyone acquainted with the long history of fairy encounters from the most ancient to Thomas of Erceldoune to now knows, as Graham Joyce would tell you, to be wary of the EDFF (extremely dangerous fairy folk). You wouldn't call them fairies either, if you had any sense. Be polite to the Gentry.

Yet in the past there were many men foolish enough to try to summon them as lovers.

The other day a friend pointed me to this link, where I ended up learning about Tulpamancy. Tulpamancy is essentially the creation of an imaginary friend who shares your body with you. The practice reminds me a bit of otherkin, only in this case instead of the person claiming they are some type of non-human entity, they instead claim that they are creating a spirit being and hosting that spirit being. Most of these Tulpamancers think of the tulpa as a psychological construct, though some ascribe metaphysical aspects to their tulpa. None of them, so far, as I know, seem to practice magic and this is only significant because they've taken a technique which is magical and applied it to their own lives without focusing on the magical aspects of the practice. 

The concept is actually a familiar one in occultism. The word Tulpa originates from Tibet and refers to the practice of creating a thought-form. Whether you know the concept through the label of thought-form, servitor, magical entity, or for that matter Tulpa, what the concept boils down to is the creation of an entity that becomes a spirit ally or performs a specific function for you. The main differences are that the magician typically doesn't house such an entity within themselves, isn't necessarily setting out to befriend such an entity, and may set up a deadline for certain task to be performed, or for the entity to be dissolved.