This website contains age-restricted materials including nudity and explicit depictions of sexual activity.
By entering, you affirm that you are at least 18 years of age or the age of majority in the jurisdiction you are accessing the website from and you consent to viewing sexually explicit content.
I think the joke is that they have it sideways and now all their heads are turned sideways as a result. He found what was making their heads tilted. That’s my interpretation.