The issue regards a segment titled 'It's Meringue Time'. The trainees had to make Meringue - a type of dessert made with whipped egg whites and sugar. Sounds sweet and innocent, right? 

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Well, it turns out that Meringue is also often used as a sexual symbol because the act of stirring up the egg for meringue enhances men's upper body muscles while the sticky egg white tends to represent men's semen. 

With this in mind, many netizens are confident that the producers, who have also previously stirred up a controversy by saying 'Produce 101' season 1 was intended to be a "healthy pornography", had some dirty intentions behind the segment. 

Now, gifs from 'It's Meringue Time' are roaming the web and netizens are highly disturbed. 

Comments stated, "Hul.....", "I was wondering why they suddenly had them make meringue", "If they really intended that then that's so shocking...", "I thought it was to show their arm muscles.. omg", "Hul... That's what it meant??", "That's so dirty. What are they doing with the kids..", "That's sexual harassment."