Email addresses can be used as well. Your best bet is to set up a free email account that is completely different from any other name/avatar you use. Then use that with distinctly different usernames at sites you want to keep private. If you really think it might be a problem then you might want to use IP proxies as well since IP searches can pull up quite a bit too. Just realize even those proxies are not sure proof. That said, most employers don't care if you visit porn sites. Most men and a lot of women visit porn sites, so every day that is less and less of an issue. Just don't do it on their equipment or at work.