spectralphelia 

The act of having sexual relations with a ghost.

She engaged in spectralphelia when she had sex with her dead husband's spirit.

spectralphelia by hthrB February 24, 2015

spectralphiliac 

A person who, for whatever reason, insists on engaging in sexual acts with ghosts.

Can you believe he sleeps with the ghosts of lovers lost? What a spectralphiliac!

spectralphiliac by hthrB February 25, 2015