A simple answer to this simple question is “no way.” But if you want to go deep into the topic there could be areas where you could get leads.
Sexually abused children keep their matters secret. Specially the fact that they were sexually abused. This secrecy hides them from being recognised as sexually abused. In addition, you would find that sexually abused children are silent and like to keep quiet.
An easier method to find a sexually abused child from a family is to compare the child with other children in the family. If you notice that one of the children behaves differently (less talkative, less active, less inteligent, etc.) than her/his sisters/brothers take it as a symptom of being sexually abused.
Lastly, do not be over-confident about the above measures. Not every child with the above qualities would have been sexually abused. Understanding and examinig these qualities is an easy task while judging them is the difficult part which is the most important.
Smile and Let Smile 
CAWM
August 23, 2007 at 6:25 pm
Dear All! Thank you for your comments. @ Anon2: We are glad that we are able to initiate a dialogue. All things said may not be pleasing. That will by taken in the best spirit by us. We understand the trauma of abuse and to live in denial for a lifetime. We have some professionals who will be contributing to the blog shortly in addition to the social activists. If you are interested to contribute please emial to cawmaldives.smile@blogger.com (Posts by non-member contributors will be reviewed before they are posted.)
Ameer
August 23, 2007 at 6:02 pm
@Anonymous,I havent been abused in childhood. But I have some friends who have been abused. I stand for them and every other child who has been abused.One reason I posted those was because I have had an experience of how abused children live (as I have mentioned in the article) and I have got some phsychological knowledge about it.Anyways, thanks for your response.
Anonymous
August 23, 2007 at 5:33 pm
Anonymous said… Have you been sexually abused while u were yung?I think it’s quite thoughtless to ask that question. For one thing, there’s no purpose to the question. Secondly, if it had been the blogger’s intention to reveal about his/her own experience, he/she would have come right out and said it. As long as they choose to keep their identity secret, other’s should respect that- unless they are close people who are concerned for the victim’s safety.
Anonymous
August 23, 2007 at 1:51 pm
Have you been sexually abused while u were yung?