Instrument obscenities

I've just been to see Stevie Wishart at the Barbican. She does unspeakable things to a hurdy gurdy - putting her fingers inside the instrument, making slides glisses scrapes rattles - amazing sounds totally appropriate to her piece ("Transients"). A friend called her the "Hendrix of the hurdy world". Somehow though it just seems rude to put your fingers inside an instrument - far too intimate to watch!