I was going to comment about that, AR. I think one of the key things about this for me was my willingness to learn and engage.
I walked into a house full of boys. They had been on their own for a while, and had bonded as boys/men will. So I had to use my curiosity and willingness to learn, to take opportunities to engage with them on their turf and integrate with them. Yeah, I could have just wandered off during their Chicago Bulls fever and read a book. But look at how much FUN they were having! And it was important to them. So, even though I had no IDEA what it was about, I sat down, and allowed myself to be the "dumb" one for a change. They taught me, and laughed at me a little, and we all had a great time.
When the boys got older and played sports, I became a rabid fan of their teams. With cowbells, and airhorns, foam fingers, etc. It was good stuff.
DH and I will watch a game on tv occasionally now, neither one of us cares much. It's something to do on a boring afternoon when the weather sucks.