Imac gets hot while gaming

My relatively new imac gets very hot and the fan comes on while gaming. I usually don't play the games but my grandchildren do and I would like to know if this use can damage my computer and what if anything I can do to protect the computer and still allow gaming. Thanks, your input will be most appreciated.

Thanks Dave. I did notice that once the fan came on and I shut down the game, the computer cooled down and stayed cool. The fan ran continously until I shut the iMac down including while I was gaming (well over an hour). It occurs to me that perhaps the fan should kick in sooner? Is there an add on that would be helpful or perhaps a small fan aimed at the computer?
In searching the web I ran across something called "smcFanControl2.2.2." ... your thoughts please. As you may have guessed, I am in way over my head here. Again, thank you.

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