coconut oil/oil based lube

[http://users.livejournal.com/_forcemajeure_/]

So, I went to Babeland today and a saleswoman asked me if I had any water-based lube and I said, "I don't think so, I usually just use coconut oil" and then she said that I should stay away from oil lubes because they are prone to causing infections. I didn't think of asking about it in the moment, but now I'm wondering if this is true? I'm pretty sure she just said "oil" and wasn't responding to coconut oil specifically, but regardless, I don't think I've ever heard that water-based are "better" for you than oil-based...