I worked for a big one years back, for several years (rev per year in the hundreds of millions). They had an innocuous alternative business name, that you could use for resumes. I think it may have been the parent company, while the porn-name was a subsidiary.. or something.

Either way, its turned out to be a total non-issue. I always used the innocuous name on my resume, but everybody generally already knew, and nobody cared. Seemed like most people I end up working with have worked there or have had a friend that did or hired someone that did at some point.

I was kind of surprised.