I hate how people just say shit now, and everyone takes it as a fact. Its kinda like guys saying that they cant cum because the girl isnt tight enough. No, mate. Your fucking death grip is just never gonna be bested by a vagina or an arsehole. In that same vein, if you need a vibrator to cum, youre clearly hitting that shit too much. If youre adding the vibrator in sometimes cos its fun, thats a different story.
I would imagine for the same reason that women complain about men who cant cum without their pornhub deathgrip…