A big Israeli professor once had a discussion with the frierdika Gerrer Rebbe, the Pnei Menachem zt’l. The professor asked the Rebbe, why do chareidi Jews have such a strong opposition to pictures of women who are not completely dressed? You must be very perverted if you have bad thoughts. He said that this never happens to him.
The Rebbe responded to him: Can you walk bare foot in the desert? The professor answered, no since the hot sand would burn my feet. So the Rebbe asked him, but the Arabs have no problem walking in the hot desert sands! The professor replied: that is because their feet have become so hardened and used to it. My feet are sensitive.
Said the Rebbe, yes and that’s how your soul has become, hardened and insensitive to inapproriate pictures, while the souls of chareidi yidden are sensitive to this.