The retail giant introduced women-only changing rooms last year after backlash to unisex facilities.
It came after Primark stores across the UK made their changing rooms gender-neutral in 2019 in a bid to promote inclusivity.
Women-only changing areas were reinstated in October 2022 after female shoppers complained of harassment from male customers.
The Primark website says: "The combined fitting area is for everyone.
"The women-only area is for all women and customers are not required to provide identification.
"If someone appears to be deliberately trying to abuse the policy, the store will manage it at their discretion."
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The Primark store in High Wycombe is among the 187 of 191 stores across the UK that currently offer both unisex and women-only changing areas.
A spokesperson for the store said Primark were making the changes to ensure that everyone has a safe and enjoyable shopping experience.
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