What's to stop you .....
doing something like this
Porn site : Are you over 18?
Viewer : Yeah, of course.
Porn site : We're not so sure, have you any evidence of this?
Viewer : "Well, yeah, actually i'm J****** S**** (1) the MP for Wankerland and my private details are D.o .B. xx/yy/zzzz etc
Porn site : Give us a second to look it up and you're in. Yep, fine, wank away.
(1) the name of my real MP has been obfuscated to protect the guilty.