@Night Ripper,
You obviously don't get it, at the same time as you do. Utilitarians, such as myself, agree that moral can be described through mathematical 'Benevolence - Suffering.' However, it is impossible to truly give an absolute mathematical weight to any action, as the opinions differ from utilitarian to utilitarian. In my opinion, the suffering you would cause the child far outweighs the pleasure you would cause for yourself, (and even then, it's a lot more complicated. The hurt I would do for myself guilt-wise, and even then, rape is more often the inability to control urges then a utilitarian philosophical justification).
I have a question for you now.
I haven't seen this movie, but presumably, the same innocent children you speak of, and many more, were hurt or killed in the explosion and it's aftermath. So either way, the innocent children are hurt. So while they didn't deserve to be tortured, in either outcome they would be.
However, the only difference is that it is you in question torturing them. Doesn't that mean you would allow more people to be injured and killed simply because you couldn't bring yourself to perform a necessary action?
That would make your action spineless, not moral.