Most of these children have been working as prostitutes and have encountered Western males in rather different circumstances.
Some five minutes' drive from the centre, cameras are rolling as the actress Kerry Fox makes her way into a seedy hotel in the company of the actor John Hurt.
In fact, it is set in Bangkok and Saigon, but the authorities there were not prepared to allow the filming of a story dealing with the twin subjects of child prostitution and baby smuggling.
There are far more in India and Thailand, and growing numbers in Sri Lanka and Taiwan, she says.
It is hard to pin down what made the child-sex trade mushroom in the Philippines, but it seems most likely that it began to grow during the Vietnam war, when American servicemen came to the US bases and resort areas for rest and recreation.
"She had such low esteem of herself that she did not seem able to see any alternative," Mr Arriola explains.
He frequently hears horrific tales of children being raped and beaten.
They were soon joined by well-organised groups of paedophiles and other overseas sex tourists who would not normally seek children for sex but quickly lost the inhibitions which would have restrained them back home.
Most of the overseas customers come from Australia and Japan, but there are also significant numbers of sex tourists from Britain, the United States and Germany.
She is cradling a very small baby provided by one of the many Vietnamese boat people in the Philippines who have been recruited to act as extras in a BBC drama being filmed in Manila.
The drama, called Saigon Baby, could be about the illegitimate baby of one of thechildren at the Bahay Tuluyan.
"There is no such thing as voluntarism for the children," says Nicanor Arriola, the programme director of Bahay Tuluyan.
He cites the example of a girl who was sexually abused by her father for three years until she finally ran away from home and found work in a girlie bar, where, almost inevitably, she graduated to the ranks of prostitute.
The carefully researched and sensitive script, written by Guy Hibbert, portrays the complexity of the situation facing the would-be parents.