My five year old son had a play date at my house with a six year old friend (they've been friends for three years). I walked in the bedroom and the six year old was trying to put his penis in my son's bum. I immediately phoned the boy's mom and they left. I spoke with my son at length afterwards and it turns out that this was the other boy's "plan" that he came up with and my son said "sure sounds good." (ugh). Anyway, it also turns out, after speaking with my son, that this boy asked him to touch his penis (my son admitted to doing that) and asked him to touch his bum (my son also admitted to doing that as well). I asked him how all of this made him feel and he said "sick to my tummy" - I said, "in a good or a bad way?" He said, "Bad". Anyway, is this normal behaviour for a six year old? The boy's mom was appropriately horrified and after speaking with her son, he insists it is just an "idea that he came up with." This seems very beyond what a six year old should know. Any advice would be welcome. Thank you.