This is very interesting since I'm an ENFJ female married to an ENFP male! We've been together for about four years, married for almost two, but we don't have children
So some of the joys..
We both love to discuss ideas and how we can both work together to make a big impact in our surrounding society! We both have huge amounts of creativity and charisma, and we actually volunteer a lot together by creating programs that benefit youth! To an ENFJ and ENFP - that is a pretty romantic relationship! We are also very good at communicating with each other, so we rarely have issues where one person is talking in a very 'direct' insensitive manner (i.e. what one could experience with a Diplomat and Analyst - here there are two Diplomats together!)
Earlier on in the relationship, we needed to both work on our listening skills since both of us are extroverts who love talking and giving advice. But I think we've managed this now

Since we're both 'NF' types - we are always very particular about thinking about the big picture when it comes to our volunteer work and helping people consistently - we're each very understanding when the other person spends a lot of time working to help someone at short notice. The only drawback is that sometimes housework gets put on the back burner, it piles up and then we have to work on it together. But we are working on this as well!
The J and P combination was a bit of an interesting combination when we were doing bigger activities - like planning our wedding and buying a house. I came armed with spreadsheets and to-do-lists, and he was a bit overwhelmed about it at first, but he seemed to really appreciate it as the work went on. From my husband, I have learned to let-go and go-with-the-flow with new experiences - so I'm probably only about 60% J now, and he is about 60% P (he schedules things in his calendar now, which I find impressive!). Isn't it interesting how a couple learns from each other?
The last thing is that when I talk to others, they seem to be astonished as to how much of our time really goes into volunteer work, v.s. spending time on ourselves. This is something that we have to also work to keep in mind, as we should try to have an hour's work of 'just us time' per week (even if it's spent talking about things like space, politics and mysticism which we find super interesting) - but having a date fused with a planned agenda of work/volunteer program items don't completely count!!