As a woman, what I love about both science fiction and fantasy is the opportunity to read about people for whom life works differently - whether they are an alien with three sexes that reproduces by laying eggs, a mage living in a world where magic is a part of physics and technology, a shapeshifter whose natural form looks like a giant water droplet, or just a student attending a space academy where they get to experience zero-gravity sports. For the same reason I love reading about cultures that aren't quite like any earth ones; maybe people organize themselves into packs or clans instead of nuclear families, maybe dragon-people have no particular use for clothes, maybe there is 100% job security because society as a whole operates like a military organization, maybe there is no money and social rank is purely a popularity thing. Maybe everyone is a hermaphrodite, do they have something kind of like gender roles but not really the same? What if aliens that start out humanoid can grow up into biological spaceships that carry other aliens through space? What if there is a type of aliens that acquires humans to keep as pets or ride as mounts? There are so many cool possibilities and interesting life experiences that I'd like to explore by reading science fiction or fantasy stories.
I've been kind of depressed by sff recently though, because it's been too dark for my tastes. I like 80's style adventures with happy endings and romance and morals like "friendship is awesome". So recently I've stuck to reading science fiction and fantasy romance, since those more or less have guaranteed happy endings. Also superhero/supervillain comedy, school comedy adventure; anything that seems like it's going to be cheerful without being unintelligent.