The general lore consensus is that dragons are rampantly sexual creatures, and I might pose a reason for that rampant sexuality later on. A dragon's top or bottom preference is entirely dependent on the dragon/NPC in question. There is no definitive "All dragons are tops."
That really needs to be made obvious in the lore, because it isn't. Every single time the PC bottoms, it's described in some way as unusual for a dragon.
If you cant find the caravan, or the eastern dragons, you are either searching for them in the wrong area, or you have an outdated version of the game. I know the eastern dragon can be found in the mountains, or maybe the plains... not sure on the caravan.
I can find them just fine. There are no bottom scenes there (or in the case of the Eastern Dragon, no bottom scenes for winning), unless they're locked behind something I don't know about.
as any encounter you get into where you could become the top should also have the option to just walk out
I definitely agree that they should.
If they're 50-50, based on how I've been playing, I should be seeing predominantly bottom scenes, since I'm not doing any of the things that cause top scenes other than random non-combat encounters. But that isn't what's happening.