A little birdy points to what s/he calls "advances in robot sex." It could also be called, "Why the Terrorists Hate Us, Chapter XXVII. But anyway you cut it, technology marches onward, if not necessarily upward. Snippets (and links to video) of transistor-melting antics:
The sexed robots are autonomous wheeled platforms fitted with nylon genital organs, respectively male and female. They are programmed to explore their environment, occasionally entering a "in heat" mode, where they will try and locate a partner in the same state. If a partner is located, the robots will attempt to mate.
Reasons to be cheerful: This technology was not sufficiently advanced when The Robotic Stooges roamed the Earth.