Er, why ? They are protected as well as any other videos and the fact that they are distributed for free doesn't mean that you can freely reuse their content without violation of the owner's rights.
After my last answer I made some search :
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have some adult oriented sounds. You need to search since all aren't free, but there's a label telling you when they are. A good start is with the tags
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,
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,
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and
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.
Same for
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, you can find them by searching
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.
And there's also
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by example. Here they are free (but you need to register to download them). A good start is probably
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.
You can also look at
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. On subs like
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or
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you can probably find some people ready to record some sounds for you. But be prepared, they'll probably ask for some (few normally) money. Anyway these subs are a good stop since you'll hear "real sex" sound and not the forced faked sounds of a porn movie. You already know what "real sex" sounds are (at least I hope for you), but while making your game it's a easy deviation to aim the "porn" effect and not the "real" feeling. So having some that you can play and repeat isn't a bad idea.
Oh, by the way, you can also try to record them by yourself (but not without the consent of your partner please).
Finally, keep in mind that sound fx are generally made using something completely unrelated to the searched sound, so browse free soundbanks. There's no real difference between a woman breathing heavily because she just finished a marathon and a woman doing the same because she have a good sex. Same for the moaning, if you arrange them correctly, few innocent moaning of pleasure or contentment can make a good sound track for an adult game. Add them to the heavy breathing you just found before, and nobody will really be able to make the difference.
So browse, listen different kind of sound, and when you feel that one can seem like a sexual sound, search similar ones until you find some that really feel like sexual sounds.
