Someone asked me about this the other day so I thought I'd just put it here.
"caveat utilitor" is latin for 'let the user beware' for those not versed. I.E. this is as much a warning to the unweary than a how to. (some people seem to not understand this so I'll just point it out)
If someone's profile is private you can still see their videos and pictures using a little trick. This will not circumvent passworded or friends only videos! Nor will it let you gain access to their about me, verification photo/video or wall comments.
Copy these to your address bar or middle click to open the hyperlinks in a new tab if you have text2hyperlink active in your browser like me.
PICS --> http://xhamster.com/user/photo/USERNAME/new-1.html OR favourites http://xhamster.com/user/photo/USERNAME/favorite-1.html
VIDEOS --> http://xhamster.com/user/video/USERNAME/new-1.html OR favourites http://xhamster.com/user/video/USERNAME/favorite-1.html
BLOGS/STORIES --> http://xhamster.com/user/USERNAME/blog/1.html
EDIT They finally fixed viewing other people favourite blogs/stories (about time) its still a little bugged as its stuck to one page though :(.
The favourites trick no longer appears to work for favourite videos when people have it set to "Don't Show" i.e. the only them setting. It used to work sometimes but recent evidence suggests this is no longer the case (it appears to always show their video uploads instead). It does still work for any other situation though (such as a private profile or friends only), assuming they have any favourite videos that is.
Copy their xHamster username and paste overtop of 'USERNAME' in the address bar
NB: can use this trick for lots of things on the internet (hacking of its lowest form) also you can use other words instead of new (such as rating) to order the galleries or videos by a different method. This will also compact he thumbnails since they wont be new line separated by date.
As Rockbitch said it can also show you their friend lists if you want to see it for some reason:
ALWAYS REMEMBER: If you post something on the internet chances are it's not really private no matter where it is or how you protect it - use common sense or have thick skin.
Update: People have been asking me recently about opening videos that are set to friends only, passworded etc - this will not get around that and it shouldn't either. This method only gets you content that is posted freely on the main page anyway (with the right amount of digging), people have the right to be private if they want to be. Just as there 'walls' are safe from you if you're blocked/private'd - there are a few ways around this but the only people who need this are doing it for unsocial/unwanted purposes. I'm pleased that xhamster introduced such features as friends only and passworded videos as previously there really was no way to do anything remotely private here.
***NEW CAVEAT*** From JuliaOnly
"For Users Who Upload Personal Videos.
I found another flaw in this site. A friend of mine has been uploading personal videos for her closest friends. She set the videos to password only. I don't have the passwords and cannot see them. However, I found quite by accident that in the news feed it had screen shots showing her face. In the news feed it displayed it as a normal video that would run through a series of set shots when you place the cursor over them. This means that any one who had her set to favorites or subscribed to her page could see these screen shots. She has no way of knowing who subscribes to her or not. Blocking is irrelevant. Users cannot stop content from going over the news feed. Content is in the news cycle for a week. You may do what you want with this information. I just thought everyone should know the facts.
PS: This also applies to videos set at friends' only."
I haven't confirmed this phenomenon but I trust its source and its something everybody should be aware of before posting passworded or friends only videos *and photos* - it will only give a few set screen shot small thumbnails. Check your own news feed to get an idea.