I think there's a few essential elements that combine to create a healthy and lasting relationship and making each other laugh is one of the most important.
Life can be complex these days, stressful, and this often places strain upon relationships and can cause them to fracture, break completely or at the very least become habit rather than all those things that brought the couple together in the first place. Laughter, can bring a welcome release from stress and the complexities of life in modern-day society and have a positive impact on a relationship as you say.
Faith and I have been together for 32 years, (33 in October this year) and married for 26 of them...For us there's many reasons we are still in love, happy and engaged with life...The ability to find humour and levity, especially at those times when life is most complex and difficult, is one of the reasons we have endured.
Playing as you put it, is a form of that and if applied correctly can play a big role in preventing a relationship from stagnating - There's many other factors, but I agree with you completely in that playfulness is important.
Good post. (Curated)
RE: Play With Your Girl