Is it okay for young boys to stick things in places to feel pleasure?

No it is not normal: I don't exactly understand what things and sticking in what places and at one age in boys. But if your question is putting objects in urethra, rectum or ears and nose. But it is no normal . I suggest your concern be discussed with the boy's Pediatrician openly.

Polyembolokoilamania: or self- insertion of foreign bodies (FB's) into one's orifices is typical for young kids & people with Smith-Magenis Syndrome, usually into their noses & ears. Masturbation is typical In toddlers on up, but a child who sticks FB's into his rectum for sexual pleasure probably has either had it done it to him or modeled for him. Don't query your child. Take him to his pediatrician tomorrow.