Manager Frank Rose has had to turn to a private security firm

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The venue in German has added the team to the payroll to teach migrants western values towards women.

During the first three weeks of summer, indoor pool Maximare in Hamm, close to the border with the Netherlands, had 16 per cent more guests.

But alongside the rise - thought to have been caused by an influx of migrants into the area - the number of sex attacks at the pool soared.

At least six separate assaults have been carried out against women at the public facility, forcing management to take action.