SexChat7 is a site that caters to horny adults who want to watch and/or participate in live sex shows with models. It's not the cheapest of porn sites but it offers some of the best quality cam shows. They have a pretty good variety of show types too.
You can sign up for a free account at SexChat7. This gets you a screen name and lets you chat with the models and save some of their pics/vids for free. If you want to use their private shows and multi-chat options though you'll need to upgrade to a paid membership. VIPs get a few extra perks too like a better avatar, a custom vid intro, and discounts on video purchases or show passes. They also get twice as many free credits as standard accounts for referring friends or getting them to join.
If you're not a member of SexChat7 yet you can register for a free account by clicking on the home page, then clicking on 'create account.' From there you'll have to choose a username, password and confirm your email address. You can also choose whether or not to allow your name to be displayed on the site and select a 'preferred' nickname. Once you've registered an account you can access the model search engine on the home page and use it to look for a model who suits your desires.
Once you find a model who looks like she might be right up your alley you can start chatting with her by clicking on the model's picture or name in the search results. You can either go into her private room or if you're not a member of the site you can send her an instant message from her profile. The latter is a bit riskier since it means that you'll be using your own credit card and that the model will see your credit card details.
One of the things that sets SexChat7 apart from most other adult sex sites is that they offer free previews on most models' videos. These are usually 12 seconds from the middle of the video and can be viewed by any user who has confirmed their identity (e.g. given their CC details). Another cool feature on SexChat7 is the ability for users to control each other's sex toy in some rooms.
While SexChat7 does have a few drawbacks (like the fact that it doesn't have an app) it's definitely worth checking out if you're into watching or participating in sex shows with hot girls who are willing to show off their ass and play with each other. The site is clean and professional and it doesn't shy away from nudity which is a plus. They accept most chronologically-relevant payment methods too and the sexy models are some of the best on the web. Plus you can always get 120 free credits if you're a newbie who signs up.