Well, the biological definition of life is being able to maintain homeostasis, undergo metabolism, grow, adapt to the environment, respond to stimuli and reproduce.
Which I guess brings us back to the initial question
Robot's aren't alive because they don't have internal organs. Things that move and don't have internal organs should not be moving.
I'm only responding to logic.
Guys, I think we are asking the wrong question. Do robots dicks come out straight out of their pelvis? Can they get an erection? Are they always erect? Can robots have an STD?