It seems more likely that genuine orgasm is either a happy cause or a thrilling consequence of relationship satisfaction. So far so good, but it also seems that a high rate of both true and faked orgasm makes for an especially high chance of infidelity.
Nature has no love of truth. It's about winning, which is to say living to reproduce. Because we are not biologically designed for integrity, we must actively attempt to prevent the social cultivation of dishonesty.
Overall, both the hooknose and the jack strategies are effective, and having two strategies increases the genetic variation in the salmon population. But this slight preference for the little guy says something important.