McDonald's has allegedly created a toxic work culture of sexual assault, harassment, racism and bullying after dozens of staff spoke out.
Some workers, as young as 17, said they are being groped and harassed almost routinely.
An email hotline has now been launched by the UK equality watchdog for staff after it was "concerned" by the findings of a probe.
Speaking to the BBC, one teenage employee in Cheshire claimed a co-worker 20 years older called her a racial slur word, asked to show her his penis and said he wanted to make a "black and white" baby with her.
An email hotline has now been launched by the UK equality watchdog for staff after it was 'concerned' by the findings of a probe
PA
Another report at a branch in Hampshire alleged that a manager had suggested a 16-year-old male worker perform sexual acts in exchange for vapes.
A current employee in Nottingham claims she was seen as "fresh meat" by male colleagues and others said managers forced them to wear uniforms that were too tight for them.
Emily, who is a former worker, said: "It's the expectation that if you work at McDonald's, you will be harassed."
The 22-year-old left her branch in Brighton last year after a male colleague in his 60s continually stroked her hair in a sexual manner, which made her feel uncomfortable.
Those who spoke out said that more often than not senior managers failed to act after workers made complaints about behaviour.
Another 16-year-old worker called Shelby, who left a Berkshire restaurant last year said: "Every shift I worked, there would be at least a comment being made, or I'd be brushed, a hand brushed across me, or it would be a more severe thing, like having my bum grabbed, hips grabbed."
She added: "It really started to affect me especially towards the end of me working there.
"I was calling in sick for pretty much all my shifts and then I left suddenly without giving them notice and I never heard back from them. I did send an email explaining why I left but they never got back to me."
A 17-year-old, named Chinyere who worked at a branch in Cheshire, explained that she was sexually and racially harassed by an older male colleague.
She raised her concerns with a female employee who allegedly told her to ignore it and get back to work.
After Chinyere suffered months of harassment, her stepfather wrote to the franchise, the corporate headquarters and the police, before the man was fired.
A 17-year-old, named Chinyere who worked at a branch in Cheshire, explained that she was sexually and racially harassed by an older male colleague
PA
Alistair Macrow, chief executive of McDonald's UK & Ireland apologised for the claims and admitted there were "clearly instances" where the company had "fallen short".
Macrow said: "In February this year McDonald's UK committed with the Equalities and Human Rights Commission to a zero-tolerance approach to any kind of harassment.
"This is supported by a companywide programme of training, the roll out of new policies and strict reporting processes, all aimed at offering the highest possible level of workplace protection for all our employees.
"Already over 2,000 of our managers have completed full awareness training and nearly all of our restaurant teams are now working within these new protections aimed at creating a safe and respectful workplace.
"All of this is backed by McDonald's Global Standards, a set of stringent and non-negotiable guardrails to ensure safe and respectful workplaces, which we expect of all colleagues and Franchisees across the world."
