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Nude modeling is fine, as long as there are limits on it.
For which purpose, you think?
In the old Greek Age, they were performing this as a sense of beauty. The art of theatre.
The art of perception, because in this era, a nude body was very common.

(Photo: Verne Studios)

The Middle Ages were, like we said, photoprints of family and friends, even naked! And the rich ones want to be immortalized on the white canvas...

In our "modern" days, money is easily involved with this nude modeling: magazines, calendars, tabloids,... The more nude, the merrier these buyers, models and owners of the paper media.
Actually, there are more charitable organisations who are using this way to 'gain' more money for their purposes. And that's near by madness. The borders of the permissible are getting more unclear in time. For example, posing naked for an organisation against pointless violence. Shouldn't that be putting some oil to the fire in this meaningless world?
Yes, the money and other 'things' will come, but it's more than wrong to promote that.
How would the children of today will become adults with more humanity on their veins?