Furious shoppers are calling on mall bosses to change their rules after they discovered men can go to the loo for free - but women have to pay 20p.
The fee at the loos in Marriott's Walk shopping centre also applies to disabled people, and only men using the urinals can use the facilities free of charge.
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Grandmother-of-four Maggie Newton, 57, has been joined by local councillors in her call for the centre in Witney, Oxfordshire, to make the charge equal.
The 57-year-old said: "I just can't believe there is still this level of discrimination and inequality in this day and age.
"Men have got a choice, but women and the disabled don't.
"If you're male you've got no worries and you just walk in.
"I spoke to the man at Marriott's Walk who told me that if men want to use a cubicle they have to pay - but for us there isn't that choice.
"I can't just say it's sexist because the disabled are affected too.
"There is sometimes call for positive discrimination but I cannot see any justification for this kind of discrimination.
"What I'm saying is keep it equal.
"At the moment women and disabled people are covering the cost of cleaning the men's toilets. We don't want to pay to clean the men's toilets.
"It all seems a bit archaic, like we're going back in time."
Maggie, leader of charity Doing It Together To Overcome, which supports local disabled and vulnerable people, raised the issue at a recent community meeting.
Town mayor Chris Holliday said: "Men don't pay, but when you want a pee you want a pee whether you're a man or a woman. It is a bit unfair."
County and town councillor for Witney Laura Price said the 20p charge affects people who may need toilet facilities most, and should be removed completely.
She said: "It is archaic and unfair.
"At the end of the day people need to have access to toilets.
"Unfortunately, if you're old, have a disability, a mental health problem or learning difficulty, or if you're the parent of young children you're getting penalised.
"It's not just a question of equity. It's a question of awarding everybody some level of dignity.
"I think when you think about who this charge has an impact on versus who doesn't really need to think about it, you realise that actually you're putting barriers there for people who have enough barriers in their life."
Marriott's Walk has not yet responded to a request for comment.