I really do not think there's any correlation between being homosexual and liking, or disliking, sports. Also, a lot of us, myself included, just would rather focus our energy and time on other things than following sports. It's not that we dislike them, it's just that priority wise they are far down the list.
There's just too many things I'd rather do, and wish I had more time to do them.
Also, keep in mind that your priorities change over time. Environment affects your passion for sports as well. I was much more into sports when I worked in an office environment. Now, my job is a physically active one and can actually be like a sport. Sometimes I get the rush at the end of the workday and tell folks, "I played well today".
I mostly start paying attention to sports now when the big games, superbowl, world series, etc. come around.