The conversation between human and AI assistant.
Why is my underwear stained yellow?
No, I haven't. But I have been working out more and sweating a lot.
That could definitely be a contributing factor then. Sweat can contain oils and other compounds that can discolor fabrics over time. It may be a good idea to try washing your underwear in a heavier-duty detergent or adding some white vinegar to the wash to help remove any lingering stains.