The character (played by Lucy Fallon) was persuaded to sleep with the males by “boyfriend” Nathan Curtis (Christopher Harper) at a sex ring party.
After earlier stubbing out a cigarette on her arm, he was seen giving her a spiked drink before coercing her into the gang rape.
The shocking moment was deemed the “most horrific” scene shown in a soap by one Twitter user, while the micro-blogging site was inundated with messages from disgusted fans.
“That's probably the most horrific scene I've ever seen in any soap #corrie #Bethany,” the tweet read.
Coronation Street spoiler: Bethany Platt was raped by three men tonight
Coronation Street spoiler: Bethany Platt was groomed into sex with three men by Nathan Coronation Street's most dramatic moments Fri, June 2, 2017
Coronation Street's most dramatic moments.
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Coronation Street viewers watched in horror as Bethany Platt was sexually exploited by her boyfriend Nathan
That's probably the most horrific scene I've ever seen in any soap
Two others continued: “What a truly disturbing ending #Corrie,” and: “That was truly awful and uncomfortable viewing #corrie.”
A third went on: “The way they look at her like she's a piece of meat in the butchers! #Corrie makes me feel physically sick.”
While others commended Corrie’s portrayal of grooming: “Finding Bethany's storyline so hard to watch but glad they raised the profile on this crime. #Corrie it is almost too well done.”
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Coronation Street spoiler: Twitter was inundated with horrified messages
Coronation Street spoiler: Nathan Curtis was seen smiling on
Ofcom confirmed that they received 13 complaints over the latest episode.
A spokesperson told Express.co.uk: ”We will assess these complaints before deciding whether or not to investigate."
Meanwhile, in a teaser from tonight's instalment, Bethany’s uncle David (Jack P. Shepherd) and her mother Sarah (Tina O’Brien) are seen dashing to her rescue.
Led by Shona Ramsey (Julia Goulding), he tells Sarah that she is being groomed suggesting the end is in sight for the poor teen.
Coronation Street continues tonight at 9pm on ITV.