You've done everything you can to put your child in a safe situation. But, sadly there are no guarantees. What if your child tells you that his coach has "touched" him. Now what?
Don't panic
This is simply a parent's worse nightmare, so saying "don't panic" probably seems a little nuts, but try not to. Your child needs you to remain calm. He takes his cues from you. Freak out, so will he. Stay calm and work it out and your child will have the resources to do the same.
Take your child seriously
Your child needs to know you are there for him and you believe him. Listen to what he has to say. Yes, it's possible that he's misinterpreted something, but it's also possible he hasn't.
Assure your child it is not his fault
When an adult takes advantage of a child, it is never the child's fault. However guilty your child feels, assure him, as much as necessary, the adult is at fault and not him. Be sure you continue to make your child feel loved, excepted and safe.
Get help
Child molestation and abuse is a serious issue. I cannot stress enough, if you suspect your child is being molested, get help. A professional can help determine if abuse has occurred and the extent of that abuse. She can also assure that your child gets appropriate medical care as well as recommend counseling services.
If You're Sure Your Child has Been Molested
Please make sure the proof is solid or you could be ruining the reputation, and life, of an innocent volunteer. If you have the proof that your child has been molested by a coach or leader, you need to take action.
Take it to the sponsoring organization
Let them know what has occurred and that your doctor or specialist has confirmed it.
Press charges
Please be careful, as I mentioned above. But if you have the proof, this is a criminal matter. Press charges. You'll be helping your child to work through the situation (and perhaps others who haven't reported it) plus protecting other children from abuse. This usually isn't a one time thing for child predators.
The bottom line
Child molestation by trusted adults is a sad fact of our modern society. I don't know if it's actually occurring more frequently or just being reported more frequently. Either way, as a mother it frightens me and as a kids' club volunteer it sickens me.
There are things we, as parents, can do to help protect our children, but when they are out of our sight, we cannot guarantee bad things won't happen. Dr. Vincent Iannelli, About.com Guide to Pediatrics has an excellent selection of resources on child abuse. Take some time to read over his articles and references. One particularly relevant article is from the American Academy of Child & Adolescent Psychiatry, Facts for Family: Child Sexual Abuse.