So what? Just like it's not the role of the school to fix your attitudes towards sexuality it's not the role of the CS class to "fix" theirs.
No one brought 'sexuality' into the classroom. It's a picture of a face.
And it's very disingenuous to say it's just a picture of a face, kids aren't morons, someone will figure out the source and spread the news.
Then that's their problem. It's still just a picture of a face.
And even as just a face it's very obviously a sexualized picture.
I'm being trolled here, aren't I?
What are you, some sort of weird face fetishist?