Perfection

When considering Perelandra, you notice a change in the actions of Ransom. In a perfect world, Ransom doesn't seem to do the things he would normally do on Earth, which happens to be sinful things, or things which might destroy the innocence if done on Perelandra. So really my question is, are the actions of Ransom changed because he is surrounded by perfection in turn making him perfect for the time, or is it just the Eldil, maybe even Maleldil, giving him perfection in order that he not ruin the perfection of Perelandra. For example, the fruit. He tastes this amazing fruit, but for some reason does not think it would be right for him to have another one just so he could taste it again. On earth he would have, here he does not. And another is that he has no sexual desire for the lady, even though she is naked and is the most beautiful woman he had ever seen. Is this because there is no sin, therefore he does not sin, or is it because he is being intentionally held back from sinning in order that Perelandra might be preserved from sin?