Scottish writer Irvine Welsh's mother reads drafts of his books to pick out any scenes that are too racy. The Trainspotting author is known for his near-the-knuckle novels in which he often describes sex acts and bodily functions in detail, but now he has revealed his most honest filter during the writing process is his mum. She even read a copy of his new book The Sex Lives of Siamese Twins and advised him to remove a scene detailing a lesbian romp. Welsh, who also penned the novel behind James McAvoy's 2013 movie Filth, tells The Independent Magazine, "Well, the old dear (mother) read it. And she said, 'I like it, son. But there was too much lesbian sex'. She said I should leave lesbian sex to lesbians - 'You dinnae ken (don't know) anything about lesbian sex'. And I said, 'Well, obviously I do, 'cause I've written about it!'. It was a bizarre thing to be discussing with your mum."