Le Mans has a small queer scene with only a few addresses, but they have been around for a while. There is no gay district as such; the venues are spread across the city.
The best-known place for a night out is Le Babylone on Rue Nationale. The club opens at weekends and runs karaoke, theme nights and DJ sets. The crowd is mixed, gay, lesbian and straight-friendly, and the atmosphere feels more like a neighbourhood hangout than an anonymous club. For many locals, Saturday night starts or ends here.
The only gay sauna in town is Delta on Boulevard Carnot. It covers about 400 square metres with a steam room, dry sauna, jacuzzi and cabins. Most days it is men only, but on some weekdays it opens to a mixed crowd. There are reduced prices for guests under 25 and under 29, and regular theme nights.
For anything beyond nightlife, the place to go is Homogène, the LGBTI+ centre for the Sarthe department, with premises on Rue des Maillets. On Wednesday evenings the doors are open and anyone can drop in without an appointment. Once a month there is also a meeting in Pontvallain. Homogène co-organises the annual Pride march and is a member of the French LGBTI+ Federation.
Don't expect much more than these three addresses. Le Mans is not a scene destination, but what exists is well established. A lot of socialising also happens through apps. If you want more choice, Paris is roughly an hour away by high-speed train.