"And then I got a call from a friend who wanted to have a show of erotic art, and I didn't have any pieces. But when she suggested to be in the show, this piece came to mind" 
The sculptures of Arthur Ganson are sometimes funny, sometimes smart, sometimes ingenious, sometimes philosophical, sometimes poetic and sometimes ironic. Most of the times it is a combination of all these mentioned above. I think Machine with Grease is a perfect example of his work. A nice combination of sex and a machine. As Ganson states:
"This is a happy machine, I'll tell you." 
But you can ask yourself; can machines be happy? Do machines have a hedonistic side? Are machines not just empty shells who wait for a command from above (the command from the human)? It happens a lot that artists give their machines a anthropomorphic touch. Think about Pamphleteer from the Institute for Applied Autonomy (IAA). They created a robot that distributed pamphlets.
'Studies have shown that people are more likely to accept literature from a robot than a human activist. Pamphleteer, aka Little Brother, is a propaganda robot which distributes subversive literature. Pamphleteer is designed to bypass the social conditioning that inhibits activists' ability to distribute propaganda by capitalizing on the aesthetics of cuteness. Pamphleteer is designed in the tradition of America science-fiction films and Japanese toy aesthetics.' 
So in short, we human beings accept more from a computer than from ourselves. What does this mean? Creating human-like objects is not something new. Think about the Greek myth of Pygmalion. He was a sculpture who felt in love with a statue he had created. He asked the Gods to make her come to life, which Aphrodite granted. But we also have the stories of Frankenstein and Der Golum. It seems that since the existence of mankind (or womankind) humans have been fascinated with creating the representation of themselves. We want to be like God. We want to create our own replica. And because the use of mud and wood seems to be ineffective for this aim, we have focused ourselves on machinery. Technology.
But even though a robot may look like us, talk like us and behave like us, I don't thinks it will ever be like us. It is missing that one thing we don't really understand ourselves: a soul. No algorithm, how intelligent it may be, can cross that gap. Or can it?
 Arthur Ganson makes moving sculpture, inspirational talk on Ted
 Institute for Applied Autonomy, in Art and Electronic Media, p.159
 Edward A Shanken, “Hot to Bot: Pygmalion’s Lust, the Maharal’s Fear, and the Cyborg Future of Art” (2005)