The Sex Lives of Siamese Twins is the ninth novel by Scottish writer Irvine Welsh, published in May 2014.

When Lucy leaves a failed romantic evening, she gets caught in a chase between a gunman and two fleeing homeless victims.

Elena Seymenliyska of The Daily Telegraph wrote, "It's a bit like his debut, Trainspotting (1993), only instead of the tenements of Leith, we're in the condos of Miami Beach.

"[1] In The Guardian, Sandra Newman took issue with the lead character: "The pleasure of the book is spoiled by a radically misjudged narrator.

"[2] In The Independent, David Pollock wrote that the author's risk ultimately paid off: "Yet how far he has removed himself from his comfort zone in writing female Americans is validated by the clarity with which he eviscerates Western society's great—and potentially most dangerous—obsessions with food, health, sex and emotional perfection.