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I'd think something like EEG or heart rate feedback would be better than sonar. Higher degree of difficulty, but much more evil.

This is being worked on as we speak, actually. There's a few companies (and, uh, me) working on biometric interfaces for sex toys. I reverse engineer biometrics stuff as well as sex toys, so there's a whole range of sensors available, and it's honestly the best interface we're probably going to get, since it doesn't require manual controls. :)

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