Asexuality – broadly defined as not experiencing sexual attraction — has been called “the invisible orientation”. Asexual people say they’re often misunderstood and that many people doubt that they can really be asexual. But awareness is growing thanks to online resources, social media and global campaigns like Asexual Awareness Week, which recently came to a close.

Sex is considered a central part of the human experience. So what’s it like not to have sexual desire? Two women who identify as asexual explain their experiences: Priyanka Chakrabarty, a lawyer and writer in India, and Yasmin Benoit, a model and writer in the U.K.

Plus, Colombia’s “cocaine hippos”: What are they, how did they go wild and why are they now being culled? The BBC’s Peter Goffin explains.

Email: whatintheworld@bbc.co.uk WhatsApp: +44 0330 12 33 22 6 Presenter: Hannah Gelbart Producers: Mora Morrison and William Lee Adams Editors: Verity Wilde and Simon Peeks