Seville's queer scene is centered on the area around Alameda de Hércules. That's also where El Garlochí is located, a bar known for its unusual, baroque, religiously inspired décor, long established as a fixture of the community and regularly mentioned in travel guides.
For sauna visits, Sauna Hispalis is one of the city's known addresses, with steam rooms and relaxation areas. For club nights, El Bunker is one of the scene's established names, with a dance floor and a rotating DJ lineup on weekends.
Seville doesn't have a self-contained gay district the way Madrid does; addresses are spread between Alameda de Hércules and the adjoining old town. Newcomers to the city are best off orienting themselves around these venues rather than a fixed neighborhood.
What Seville offers is a compact but reliable queer infrastructure, set within the city's Andalusian hospitality and its general nightlife, which in any case tends to run until the early hours.