As far as I know not currently illegal in any jurisdiction in the United States but it should be. It is illegal in a number of other countries it is. There have been several cases in the UK over Rape by Deception, and there has been a few famous cases in Israel including one man that was convicted of Rape by Fraud for claiming he was a neurosurgeon, and another for claiming he was Jewish and unmarried.
That last one's not the best example (and I believe it got overturned on appeal). I mean, it opens up a whole other 'can of worms'. You look white, and sleep with a hard-line racist while failing to mention you had a black great-grandparent? Is that rape? Where does it end?
On the other hand there's the case here of undercover cops having relationships, and even children, with women they are spying on (for, frankly, trivial purposes, i.e. environmental protestors), all while never letting on about their real identity and pretending to be a completely different person. If the Israel case is rape, then the police here are surely complicit with multiple rape? The level of deception seems greater in this case than in the Israeli one.