An early adopter of the Alia Reploid Romance Unit takes his time testing out Alia's reaction to different forms of stimulation. Her skin contains a carbon-sensitive metal alloy that detects different forms of moisture to form appropriate reactions.
Also buy her friends.
lia is fun to characterize in non-lewd situations since she's actually programmed to hawk of RRU products regularly.
I'm sure there's an intelligent discussion we can have here about hyper-consumerism, buying companionship and capitalism.