I doubt heaven will be boring. The Bible tells us that for the most part it will be like life here on earth -- we'll have jobs, houses, friends, etc. I'm sure there will be music. Why wouldn't there be playstaions, and Wiis, and sports and stuff? I think there will be.
But there will be no sin. No pain. No tears. That's pretty cool. I can't even imagine that.
Yea, there won't be any marriage or sex. But I have a feeling that even the "worst" thing about heaven will far surpass the "best" thing here on earth.