Sex with someone with a familial relationship, but no blood relationship. Sometimes treated as incest in the law, but not as much of a taboo subject in common society.
"Dude, she's not my mom! She just married my father."
"So that's pseudo-incest. Still illegal in this state."
by Stevarooni September 11, 2016
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In literature, any book that contains some form of explicit content (such as romance or sexual activity).

In crime, the act of sexual activity involving non-genetically-related family members (Such as step-family or adoptive-family members).
(Literature) My friend is reading a book which contains pseudo-incest. They said that it's a good book so far!

(Crime) My uncle is going to court for his two acts of pseudo-incest, having sex with his adoptive niece and his stepmother.
by Alan T. Fitch May 3, 2022
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