During adolescence, many people occasionally masturbate as part of their sexual development.

masturbate 是动词，意思是"自慰、手淫"。这个词来自拉丁语 masturbari，由 manus（手）和 stuprare（玷污）组合演变而来，现在用来描述通过刺激自己生殖器获得性快感的行为。