sexual behavior - 5 years old boy

Hi, sorry for writing in English, I have a problem with my PC. Appreciate if you could answer in Hebrew. My son is 5 years old. When I came to pick him up from his day care (Tzaharon) yesterday, his kindergarten told me that in the day before he asked one of the new boys there who is 3.5 years old to come with him to the toilet and touched the intimate parts of his body. From this reason the little kid didn't come to the day care. I was shocked and talked with my kid about it, while mentioning that we should respect others’ privacy and that it is not acceptable to touch other kids, same as no one can touch him. When I told him that he denied that he did it although I was very calm and didn’t show anger. I have to mention that it is the first time my kid touches someone (at least that I know about it) but there were 3 different incidents in the past when he express sexual interest; The first one was last year when I was told that one boy from his day care asked him to undress to “show” him (the other boy initiated it), the second one was when I saw him showing his organ to one of the girls in his kindergarten and the third one was when my husband found my son and other friend going together to the toilet in our house and didn’t allow them to go together. In all 3 cases we talked with our son the same as we did today. I am very worried. First because it looks like that although we talk with our boy, he continues to be involved in such cases and doesn’t understand the limits, and second because he keeps denying it. What else should I do? Should I update his morning kindergarten about the last case? I know she talks about it with the kids, but should I ask her to keep an eye on him? On one hand I’m afraid that he will continue with this behavior, but on the other hand I wouldn’t want to give him a feeling that he is bad. Should I go with him to professional psychologist at this stage?

שלום לך מיכל, ילדים בגיל הזה סקרנים לגבי הגוף שלהם ולגבי הגוף של המין השני. בדרך כלל לאחר שהסקרנות שלהם מסתיימת הם יכולים לעבור להתעניין בדברים אחרים. מצד שני, כמובן אין זה אומר שאנחנו אמורים לספק את הסקרנות שלהם באופן ממשי וריאלי. דרך ספרים ובובות ניתן להסביר לבן את איברי המין הזכריים והנקביים , וכן הלאה. התפקיד של המבוגרים לדאוג לכך שילדים לא יעסקו בנושא המיני. בגן , זה תפקידה של הגננת ובבית זהו תפקיד ההורים. לא צריך לדבר על הנושא אלא להפנות אותם למשחקים ולעיסוקים אחרים כאשר נראה שהם מתמקדים בכך. אם את רואה שהבן ממשיך להיות עסוק בתחום והדברים לא פוחתים, ניתן להתיעץ עם פסיכולוג של ילדים. מה דעתך? אהוד גלבוע