if the grandmother wants to fly, nothing will stop her, sometimes even the absence of sex with her is not a 100% contraceptive, that is to say about condoms which can be penetrated and the content removed.
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Do not talk to unusual people. And throw your condoms wherever they get, where these foolish people can find them. The absence of sex is not contraceptive. Or pay for the foolishness of communicating with them, too.