Well, if you want to see it that way, yes, there is something wring with gay sex _displayed on my computer screen at work_. But there's also something wrong with heterosexual sex, lesbian sex, furry sex, bsdm sex, non-binary sex, whatever you want.
What I wanted to point out was specifically that the issue was not the "gay" part, but the "sex" part. Again, not because it exists, but because it is not appropriate at work.

Now, you can think of this as puritan. You may believe that one should be able to put on whatever pornographic video on their computer all day long when at work and other people should just accept this the same way we accept people putting pictures of their children as wallpaper. Ok sure, the distinction is arbitrary, but this is a different debate.