Bathhouse expectations

Going to a bathhouse for the first time. I’m 32, fit and vers. No idea what to really expect. I’m not a prude and pretty experienced sexually but I am a bit nervous.

Do I go and plan on just topping or bottoming or do people switch up?

Is it kind of understood that if you’re a bottom you’ll let anyone fuck you? I realize you can always say no but in reality what’s that vibe?

Do bottoms expect you to cum? Or do you fuck as many guys as you can without cuming?

If I get a room and leave the door open can I go ass up and just assume the guys will know they can come in and fuck me without talking about it? I kind of want to just let anyone top me and feel really slutty and used.

Am I totally overthinking this lol??