In the intro to the Trade, Mills specifically says he talked to his daughter's mates to a) get dialogue tips on how young people talk and b) to ask them what they would do in certain theoretical situations.
This presumably, is his justification for ensuring that all female characters are inclined to sleep with Paul/Finn /Mills's favourite character...
This presumably, is his justification for ensuring that all female characters are inclined to sleep with Paul/Finn /Mills's favourite character...