Physical self-defence techniques work just as well against acquaintances as strangers, and much of the "safe drinking" stuff is potentially helpful against date-rape. It's certainly *harder* to protect against acquaintance rape than the 15%-odd of rapes committed by strangers, but I don't think it's fair to say that rape-prevention techniques are completely useless there.
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Physical self-defence techniques work just as well against acquaintances as strangers, and much of the "safe drinking" stuff is potentially helpful against date-rape. It's certainly *harder* to protect against acquaintance rape than the 15%-odd of rapes committed by strangers, but I don't think it's fair to say that rape-prevention techniques are completely useless there.