Find your frog hihihi great title! I think that the secret is what you wrote : growing as individuals and as a couple together. I think that it can't turn out wrong when people work on themselves, therefore improving their interactions with the others.
There's so many moving parts to a relationship, not just the obvious physical ones either. Lol
What works for one may not for the other, but with a couple people growing together and individually within the relationship there's a fair chance that they're on the right track. There's other things of course...One needs a holistic approach, or so we have found it.
Thanks for your comment, I always enjoy receiving them.