RIHANNA tells the new issue of "Rolling Stone" that she and CHRIS BROWN are in a pretty good place . . . quote, "We don't have those types of arguments anymore.  We talk about [stuff].  We value each other.  We know exactly what we have now, and we don't want to lose that."  But she adds, quote, "He doesn't have the luxury of [effing] up again.  That's just not an option."