5 yr old having erections

[southamericanmom]

My 5 yr. old boy has been experiencing erections lately.  About 2 to 4 times a day.  I have noticed that sometimes it happens when I'm kissing and hugging him.  Other times it just happens.  I understand that this is normal behavior but I'm concerned because lately he has asked me to touch his penis!  In fact, he asked me to "rub it".  I was shocked but responded naturally "Why? Does it hurt?" as I usually rub a part of his body when he gets hurt or falls.  But he just responded "because It feels good"  I told him that that is his private part and that he could touch it but I wasn't going to rub it.  Since then, he has asked his older brother (8) to touch it and also has asked his dad.  Another day he tried to direct my hand to his penis but I pulled away and told him no.  This is very new to me.  My oldest son never did anything like that.  
I know people  may think he might have seen something since you can't know what kind of parent I am but I assure you, this is not the case.  My kid's father and I have been divorced for a while and I live by myself with my two boys.  Their father is extremely involved and we are good friends often doing things the 4 of us.  My 5 yr old is a very typical kid, goes to summer camp, we play tennis and go bike riding, learning to write and we read books every night-bedtime is 7 pm weekday and 8pm weekend.   He always has done things early like starting walking at 9 months and riding a two wheel bicycle before he turned 3.  Is this the same?  I asked him if anyone has ever touched his penis but he responded no.  His big brother complaints that he keeps asking.  He seems very happy-he just flew past me on his scooter!  Do I have a reason to be worried?  Any other parents in the same situation? Sorry for the long post.

[margypops]

Hi Reading your Post it does sound as if hes copying a behavior someone has done to him, also the person doing it nearly always says that if the they told, no one would believe him or that they would get in a lot of Trouble, you need to observe what is ahppening and Play detective,who is he alone with, Older siblings , nephews and nieces also Baby sitters, Grand Parents, the list is endless. Play it down with him not to make him feel Bad he didnt do anything wrong, as its you hes trying to be "affectionate" with has he a teenage girl as a baby sitter young Aunt?. If you are Observant you will find out for yourself., Maybe feeling worried is too strong but I dont think its a good idea and the perpetrator could be doing it to others also it was probably done to them. He'll be okay you have realised as a good Mom something is going on., Play detective!