Strictest Jain answer: If you deliberately looked at a naked person, then for a strict Jain practitioner it is still a fault, even if you did not feel sexual desire at that moment.

Why:

• In Jainism, the main cause of bondage is passion / kashaya like lust, attachment, curiosity, excitement, or carelessness.
• If there was truly no lust, no attachment, and no inner impurity, then the bondage is much less than if desire were present.
• But deliberately placing the mind on nudity is not ideal for a Jain householder, and for a monk or nun it is especially against restraint.

So the strictest answer is:

• No sexual desire: less sin than with desire.
• Deliberate viewing: still not fully clean from fault, especially under strict Jain discipline.
• Accidental seeing: not the same as deliberate looking.

In short: Without desire, the sin is reduced, but deliberate viewing is still considered improper in strict Jain conduct.

If you want the strictest answer for a householder vs. monk/nun, I can give it in that exact form too.