Simson Garfinkel has written a new Technology Review article on the subject of Robot Sex - not sex as in robot procreation but as in robot gender. Is your robot a male or female? It turns out Honda thinks Asimo is a male and consistently refers to it as "he". The Roomba, on the other hand, is female according to the author. The article also mentions the Neiman Marcus his & her robots which included a male and female robot. There's a related Slashdot discussion.