‘What is ‘sexual orientation’ for?’ is a question we need to answer when addressing a more seemingly basic one, ‘what is sexual orientation?’. The concept of sexual orientation is grounded in the concepts of sex and/or gender since it refers to the sex or gender of the individuals one is sexually attracted to. Typical categories of sexual orientation such as ’heterosexual’, ‘homosexual’, and ‘bi-sexual’ all rely on a sex or gender binary. Yet, it is now common practice to recognize sex (...) and gender categories that transcend the binary. Should our sexual orientation categories be revised to reflect sex and gender diversity? Drawing on the example of pansexuality, I argue that they should. The reason is that one aim of reconstructing the concept of sexual orientation—in addition to the epistemic goal of understanding— should also be political: it should make it easier to argue for the protection of those who have been marginalized or discriminated against because their sexual attraction is other than heterosexual. (shrink)