The Download: Talking dirty with DeepSeek, and the risks and rewards of calorie restriction

AI companions like Replika are designed to engage in intimate exchanges, but people use general-purpose chatbots for sex talk too, despite their stricter content moderation policies. Now new research shows that not all chatbots are equally willing to talk dirty. DeepSeek is the easiest to convince. But other AI chatbots can be enticed too.

Huiqian Lai, a PhD student at Syracuse University, found vast differences in how mainstream models process sexual queries, from steadfast rejection to performative refusal followed by the requested sexually explicit content.

The findings highlight inconsistencies in LLMs’ safety boundaries that could, in certain situations, become harmful. Read the full story.

—Rhiannon Williams

Calorie restriction can help animals live longer. What about humans?

Living comes with a side effect: aging. Despite what you might hear on social media, there are no drugs that are known to slow or reverse human aging. But there’s some evidence to support another approach: cutting back on calories.

Reducing your intake of calories and fasting can help with weight loss. But they may also offer protection against some health conditions. And some believe such diets might even help you live longer—a finding supported by new research out this week.

However, the full picture is not so simple. Let’s take a closer look at the benefits—and risks—of caloric restriction.

—Jessica Hamzelou

This article first appeared in The Checkup, MIT Technology Review’s weekly biotech newsletter. To receive it in your inbox every Thursday, and read articles like this first, sign up here.