Porn can get you fired very quickly. The acronym NSFW (not safe for work) is posted as a warning for just that reason.
If a person works at work and watches [legal] porn at home, they are perfectly safe. If a person watches porn at work, they are asking to be fired at least because they don't do what they are supposed to do.
All things considered, even a terabyte of porn at home cannot get you fired. However a "wrong" joke at work can cost you your job. Or a Presidential nomination, as it happened to one Herman Cain.
Unless you’re the son of an upper management type and a minority to boot. Stay on the payroll, get an office, and a promotion, presumably out of the way.