The news: The popular AI image generator Midjourney bans a wide range of words about the human reproductive system from being used as prompts, MIT Technology Review has discovered. The list of banned words seem to skew predominantly female, including terms such as "placenta," "fallopian tubes," and "mammary glands." The company says it's banning these words as a stopgap measure to prevent people from generating shocking or gory content while it "improves things on the AI side." Why it matters: Midjourney's crude banning of prompts relating to reproductive biology highlights how tricky it is to moderate content around generative AI systems. It also demonstrates how the tendency for AI systems to sexualize women extends all the way to their internal organs. Our senior biotech reporter Jessica Hamzelou has been in Lisbon, Portugal this week to attend a scientific conference on brain stimulation.