"If you release victims without giving them proper care and treatment they will often go back to being sexually exploited," said Pablo Villeda, IJM's vice-president of operations in Latin America, who works closely with local authorities in sex trafficking cases and in supporting rescued victims.
The rescuers hope that sting operations can deter other sex traffickers and tourists.
The price for a girl for the six-hour sex party was $500.
"They talked to us as if they were selling a product. We were told the girls would do anything we wanted, however we wanted," Matt, 43, told the Thomson Reuters Foundation in a telephone interview.
"At first the traffickers working on the beach offer you women but eventually, if you talk long enough with them, they will offer you young girls.