Gor is definitely a D/s relationship primarily. This is at the heart of Gorean philosophy... Men are generally Dominant, and women are generally submissive.
I hesitate to say anything about "most" Goreans, but some definitely do incorporate BDSM into their lives as well. The novels tell of many instances of physical discipline, but it is just that... discipline. Punishment. Neither the Master nor slave would receive and pleasure from the exchange.
Gor is more of an overall lifestyle than a kink. You will never hear the phrase "bedroom Gorean".
For some, yes. For some, no. In my unscientific observations of the Gorean community I would say that there are a fair number of Goreans who also practice BDSM... just because it is a kinky good time. In my relationship we practice bondage and S&M because it turns us both on... so why would we deny it from ourselves? It has nothing to do with Gor though.I will always be submissive/slave or whatever you want to call me, without the kinks and fetishes. But I prefer to have both if I can.
Is this the same for Goreans?