一位昔日的朋友来访,羞于启齿地说起一件事:他的3岁儿子与隔壁家同龄男孩自小在一块玩耍,从幼儿园到小学一起上学,情同手足,形影不离。但近来他感觉到两个孩子常背着人躲在一起,关系似乎有些反常,细心的父母终于发现两个孩子在一起干着“下流的勾当”,如互相玩弄对方的生殖器等等。对此,他 An old friend came to shame about one thing: his 3-year-old son and his boy of the same age next door played together as a boy and went to school from kindergarten to elementary school, feeling like brothers and sisters. Recently, however, he felt that the two children were often hiding behind their backs. The relationship seemed somewhat abnormal. The attentive parents finally found that the two children were working “dirty things,” such as playing with each other’s genitals and so on. In this regard, he