Original sentence: " NAMBLA's critics say that despite this disavowal, NAMBLA functions as a meeting place and advocacy service for men who engage in illegal sexual acts with children.A number of alleged NAMBLA members have been charged with and convicted of sexual offences against children.Many critics, however, see NAMBLA as a front for the criminal sexual exploitation of children.NAMBLA does not engage in any activities that violate the law, nor do we advocate that anyone else should do so.NAMBLA's website says: "NAMBLA does not provide encouragement, referrals or assistance for people seeking sexual contacts
Edited sentence: Critics believe that NAMBLA contributes to the sexual exploitation of children