You had a plasma TV, but since it is an older model I'll say it anyways.
I play on a 50' plasma TV bought this year and as far as gaming is concerned the images change enough so you rarely notice burn-in. You need a really long time of a fixed image (over 2 hours, I think) to even move out of warranty coverage, at least here where I live, so yeah. Also, today morning I watched the Bahrain GP and it took like 10 seconds for the burn-in of the lap count in the top of the screen to fade away, so I don't see why porn should cause you any issues, lol.
And yeah, they have faster response times, higher refresh rates and better collors, but also consume a lot of energy and shed so much infrared that I heard it could be an issue for playing Wii, due to the sensor bar, though I haven't had issues like that while playing Pandora's tower.
If you have the money, go for a Samsung or Bravia LED, but for me plasmas offer the best bang for the buck.
