What to do in case of sexual manifestations? 
    For starters, it's important to keep your composure.
You don’t have to succumb to the fear that something is wrong and go to extremes. Despite the shock and anxiety, you should remember that shouts and threats are inappropriate and would be whether the opposite effect. Here it would help to have a calm conversation, without very long sentences, at an appropriate time, explaining that children are curious about their bodies and bodily sensations, but their bodies are still growing and evolving, and they need to take care of and respect them as they grow up.
    All these manifestations are related to the sexuality of children, which is radically different in nature from that of adolescents and adults. It fades over time and in the next stage of the child's development ceases to generate such active interest.
    Sometimes it is possible to observe more pronounced manifestations of sexuality, in which the child uses highly cynical and specific language for the sexual act and has a conversation as an adult. Another atypical behavior is to have sexual behavior towards other children, as an adult usually has. In such cases at this age it is advisable to consult a professional.