Don't just take in the info, put it to good use. No one says you have to become an avid fan of watching the UFC fights or become a guru that knows about the history of NASCAR but little efforts such as actually watching the game with your fella all speak volumes to him as to how much you care about sharing something together. Remember, don't just be there, be active. Sitting in silence as you and your parnter watch a boxing match is boring. Pick someone to root for, react when things happen, yell at the TV when something happens that you don't like. Those are the actions that will have your sweetie seeing you in a new light.
Being open-minded doesn't mean changing who you are or the things you like. It simply means learning to find appreciation in the things someone else finds of value and understanding how those interests contribute to the person they are. You'd be surprised by how much you can learn about the character of your significant other by taking note of what they like and why.