Exactly how steamy is this story?
PG
There is no sex in R.U.R. Robots do not have sex, and humans don't either. Robots don't kiss robots, humans don't kiss humans, humans don't kiss robots, and no one kisses toasters. Chasteness abounds.
While there is no actual physical intimacy, though, the play gets a PG rating by suggesting that it knows that humans may sometimes have sex, and robots may too. Nana declares that, in the advent of robots, "The Lord has made woman infertile" (1.150). People are having sex, in other words, but nothing is coming of it. And at the end of the play, after robot Helena and Primus go off together, Alquist is happy because life will "begin anew with love; it will start out naked and tiny; it will take root in the wilderness" (3.229).
One way to make new robo-folks in R.U.R. is by building them in a factory. The other way, never quite stated, but always there in the background, is by having sex. R.U.R. is so un-steamy because it's always carefully trying to forget about possible steaminess—which makes it just a little steamy, after all.