Hi, I had gone through your question and understand your concerns. Actually, interest in sex increases and children may begin to experiment with sexual behaviors with other children. Puberty can begin as early as age nine; with the onset of puberty, boys are able to ejaculate and have “wet dreams.” “Locker room behavior” is quite common, including comparing genital size and function. Older children in this age range may begin to experiment with “petting” over and under clothes, French kissing, and touching or rubbing each other’s bodies. Masturbation may be a preferred pastime. Children may simulate intercourse (dry humping). Parents can be instrumental in encouraging their children’s sexual development in positive ways. Generally speaking we should explain, that adults need it for creation family and delivery children, that now he should study to be independent, then you can marry.Just stay calm, don t show real emotions . Gently provides a message to the child that the behavior may be inappropriate and switch on him to other activity. Hope this helps