Kathleen Stock is a Professor of Philosophy at the University of Sussex. She works in philosophy of imagination and fiction, and has a growing interest in issues of gender, sex, and sexual orientation. She has also published on the nature of sexual and other kinds of objectification. Her most recent major publication is Only Imagine: Fiction, Interpretation and Imagination (Oxford 2017). This podcast is an audio recording of Professor Stock's talk - 'What is Sexual Orientation?' - at the Aristotelian Society on 3 June 2019. The recording was produced by the Backdoor Broadcasting Company.