If a key opens many locks, it's a master key.
If a lock is opened by many keys, it's just a shitty lock.
The lock and key theory was dreamt up in Liverpool, England by an un-named genius. It states that a guy is like a key, and a girl is like a lock. A key that opens many locks is a master key, yet a lock that is opened by many keys is a shitty lock. This theory is rarely favoured by females... for some reason.
The lock and key theory is most suitably used to shut a girl up that complains about male sexual promiscuity being praised by peers, while that of a female is frowned upon.
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I consider this simile to be fundamentally flawed. The comparison between a woman and a lock (and a man and a key) only works in the first place if you assume all those patriarchic macho ideas and ideals as a given truth. Thus, you're basically begging the question (logical fallacy) because you include the conclusion of the simile in its premise. Objectively speaking, there is no logical connection between a woman and a lock. You might as well say the woman is the key and the man is the lock and suddenly, things look very different.1
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