Our expert says:
For kids to masturbate, on their own is entirely normal and healthy. AT around 5, to experiment a bit with each other, is also more frequent and normal than most parents seem to recognize. I'm not sure, though, what you mean by "constantly", which sounds as though it lasts all day and they have to be dragged apart at mealtimes, and I doubt it is so. I don't see how injury could occur. Yes, it is wise to talk with the child about how private parts are meant to be private and to discourage too much playing around with other kids in this particular format. And point out that other people will be bothered by them doing this, so it is inconsiderate to others, too.
When you discuss this with him, what is his response ? Yes, it is possible that he has been interfered with by someone ( that is, sadly, a possibility with any child ) and more overtly sexual behaviour is something seen more often in kids who have been molested ; but most of the time it occurs, there has been no molestation.
If the behaviour continues, and appears resistant to your advice and encouragement to stop it, seeing a child psychologist could be useful to consider
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