People don't just browse in phones. They browse on computers. Colleagues come over to their work area to talk with them and often see what's on the screen.
I'm not prudish. I'm fine with adult content in the privacy of my own home. It's not suitable at work which should remain professional. I also wouldn't want my kids seeing porn when they are too young to understand.
You seem to be having an imaginary argument and don't understand what I, or other users are saying so I'll leave it here..