It is not "such an embarrassment", but something that I do consider inappropriate in the workplace.

If you disagree, would you feel ok to present something at work with a slide containing a domain such as "gaysex.cloud"? Make it whatever you want about heterosexual intercourse if you believe that I'm having issue with the word "gay", that's not my point.

You would present that to your boss, to your intern, to your clients without a second thought?

I have an extremely strong negative opinion about corporate "policies", but asking employees to avoid pornographic URLs in their work is not part of it.