having fans behind your cheeks that speed up when you're flustered... it's like blushing but people can also hear it happening
Thinking about robotgirls. Imagine having a fan that whirl up or down depending on if you're anxious or excited or relaxed, making that clicking sound hard disks make (which I know wouldn't be suited for a robot but i like the idea ok) whenever you think or try and remember something, getting your components refurbished like a spa day or manicure or even going out and buying a new shiny component as a treat. Being able to make physical adjustments to yourself or have someone else fiddle around with your workings inside. Making out with someone and they know you're into it because every component is buzzing and whiring and running at full power. Having to be plugged in but not necessarily needing to sleep and for briefer periods than humans, yet you still choose to sleep with your human gf/bf so you can be together. Talking with other robot girls about the components you use and new things you're trying out.