Immature meaning they lacked the reasoning capabilities of girls their age. Itachi blinked. Someone had probably talked to Sasuke about safe sex, right? Itachi had gotten lectures from his gennin instructor, they were more aimed at his older teammates, but Itachi didn't remember his parents talking to him about it. Should he talk to Sasuke?

No, that would end horribly.

"Maybe you should talk to him about it."