When a living corpse climbs out of her during an awkward night of sex, Stacy learns that her vagina is actually a doorway to another world. She persuades Steve to climb inside of her to explore this strange new place. But once inside, Steve finds it difficult to return... especially once he meets an oddly attractive woman named Fig, who lives within the lonely haunted world between Stacy's legs.
Not to be confused the previous haunted vagina. Since this guy appears to write 7+ books a year, I'm guessing this is what happens when the underbelly of Usenet meets self-publishing.
You should probably just read Kathy Koja's The Cypher instead.