To take a shower is US English; to have a shower is UK English.
So they are both correct.
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'In the shower' would be correct as the world 'shower' does not
strictly define the shower head.
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To answer this question the voltage of the shower is needed.
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We see both "couple's shower" and "couples shower" being used
interchangeably and at about the same frequency. Grammatically, the
correct term is "couples shower".