Some people will find that distressful but you know, if it's not harming anyone outside that "relationship" why not?
As much as the initial purpose of obtaining sex robots may be likewise to traditional porn (sexual discharge), it tangibility will likely enhance the formation of relationships. This time however, the “crush” will become a motive that one can act upon.
P.S. How is a sex robot different from a doll asides from being electronic?