It's very true. Being a Dominant does not make One a Sadist, and being a submissive does not make one a masochist. There are many D/s couples whose relationships do not involve pain in any form. There are also many submissives who aren't masochists, that simply accept pain from their Dominant in an effort to please. They aren't receiving pleasure from that pain in any way, but they are instead receiving pleasure in the fact that they are able to please by serving in this manner. In my opinion, this is another topic that bears discussion and communication in any new lifestyle relationship. I think it's just part and parcel with learning to know and understand one another. As for making the distinction, I would think that it would be as simple as explaining that there is a difference between experiencing pleasure in the ability to be pleasing, and experiencing pleasure from pain. Good discussion topic!