NEW YORK (AP) _ Calvin Klein is pulling an ad campaign for jeans that some critics called child pornography for its portrayal of pubescent boys and girls in provocative poses.

Calvin Klein Inc. ran a full-page ad in The New York Times on Monday explaining that it will stop the campaign, in part, because it has ``been misunderstood by some.''

Although the jeans ads are on television and in magazines, their appearance on 150 New York City buses ignited debate about sex, youth and gender roles. Some child welfare experts condemned the ads as something akin to soft-core pornography.

Some of the ads display young models in denim shorts that reveal their underwear, and in one, a teen-age boy wears black nail polish. One boy isn't wearing jeans at all, just underpants and a vest.

Despite its decision to pull the campaign, Calvin Klein said, ``We continue to believe in the positive message of these ads.''