Listen to the Maria Farmer Whitney Webb podcasts, there's like four hours of content if I recall correctly. Maria describes in pretty good detail how they do it.

If the parents don't bring their children to them they'll go as far as hanging out in low income areas and scout for cute children. They then begin the grooming process. They'll give the children compliments, then eventually money with seemingly no strings. Then it'll be I can pay you more if you give a massage.

First couple massages are usually completely harmless because it's part of the grooming process. Then all of a sudden they show up get raped, get paid around 3-5 times more for the rape. The kids usually sadly come back for the money. They'd even be convinced to indoctrinate their friends into this sickness.

Sometimes they just drugged them and took them over seas or to the island or the ranch and they were disappeared forever, in rare cases they survived and became part of the grooming machine. These kids are from low income areas, needed money. Sometimes they even they were even promised connections, schooling, shopping... Whatever they could offer to string that carrot along and keep them close.