Sarah Lucas: ‘I have several penises, actually’

Bawdy, boozy British artist Sarah Lucas has settled into a new life of tea, pyjamas and non-stop plastercasting of genitalia. She tells Charlotte Higgins about the pressure of representing her country at Venice Biennale – and why if she hadn’t quit her hard-partying YBA life she wouldn’t be around today
We are sitting on the back terrace of the British pavilion at the Venice Biennale. Beyond us, trees coming into leaf descend to the bank of the lagoon, and the chug-chug of vaporetti is jus