Arkansas Syndrome
Arkansas Syndrome is when a person tends to date/fuck (at least) one of their family members
Person 1: hey Jim wanna go out to eat tonight
Jim: sorry I can't, I'm going on a date
Person 1: oh okay, with who?
Jim: my sister
Person 1: I didn't know you have Arkansas Syndrome
Jim: sorry I can't, I'm going on a date
Person 1: oh okay, with who?
Jim: my sister
Person 1: I didn't know you have Arkansas Syndrome