To add yet another entry into the genre is Asimov's _The Gods Themselves_, where humanity exchanges energy between themselves and a parallel universe with diffe

To add yet another entry into the genre is Asimov's _The Gods Themselves_, where humanity exchanges energy between themselves and a parallel universe with different physical laws, only to discover those physical laws are leaking over and will result in the destruction of the Sun. The middle section is the story of the aliens in the parallel universe and is an interesting look at a three-sex species, and it makes me wonder how Asimov would interpret modern LGBTQ issues.