AFAIK, everyone musks. If they feel like it. Kings and milks seem to feel like it frequently!
Here's an example of Inez's musk. Choco luckily only feels like releasing chunky (smelly) urates. So imagine this, on my PJ shirt.
But Tickel Chox Till She Rattles is so funny, it's worth it! (I'm not torturing her, I swear! If I stroke her gently along her side, in her last quarter, she'll start rattling, and will eventually rattle if I so much as touch her. I _could_ stop before she musks, but it's just so cute...)