One thing is when a guy gives a girl a vibrator or another toy himself, or when a girl discovers the presence of a vibrator, offering to involve him in joint sex games. What an insult. Completely different - when the presence of this same vibrator was a secret of the girl and discovered accidentally after his breakdown. This is really offensive, and I hope I explained above why.
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Eeee... Why? What if you suddenly wanted to, and the guy is not there? Can you not self-satisfy? I propose then to be offended by the presence of the girl's fingers, soul and any objects of phallic shape.