It depends on who is your target customer, but unless they are especially both tech-savvy and open-minded, this is probably a bad idea. Most people will assume

It depends on who is your target customer, but unless they are especially both tech-savvy and open-minded, this is probably a bad idea. Most people will assume you mean something.xxx.com, or that it's a dev url and you haven't launched yet. If they are brave enough or native enough to Google your name, whether or not your site ranks, they will be presented with pornography one way or the other. Your url may or may not get automatically turned into a hyperlink in their email and chat clients. As you said, your emails will not make it through corporate filters, your site will be blocked, etc. You might be able to work around technical issues with secondary domains, but from a business perspective you will vastly limit the pool of clients willing to give you a shot.