Automatic Lovers: Should we be worried about sex robots?

Interaction with fully functioning robotic sexual partners could soon be a practical alternative to relations with human beings. Sex robots would be programmed to be ever-consenting sexual partners, to perform while saying and doing all the right things, but have no consciousness. They would be unable to share experiences as we do as they could not listen, communicate or care, nor can they experience joy and exhilaration, rejection or disappointment. So are sex robots an innovation to be embraced or could their use displace intimate relationships with living beings?