from big straight porn studios:

In the adult space, the big studios are still experimenting with VoD business models. Vivid (www.vivid.com) recently reached an agreement to distribute video on a pay-per-minute basis over HotMovies.com. HotMovies charges from $.08 per minute for access. They also offer full movie downloads and 48-hour rental. David Schlesinger, vice president of licensing for Vivid, says more major VoD distribution deals will be signed soon.
(found here: http://www.avnonline.com/index.php?Primary_Navigation=Editorial&Action=View_Article&Content_ID=107161)

to big gay porn studios:

(SAN FRANCISCO, CA 03/09/2004) – NakedSword.com, an online leader in gay adult Video on Demand, and TitanMen.com, a leading producer of gay adult entertainment, announced a deal today that will distribute TitanMen.com films via NakedSword.com. The licensing agreement will allow NakedSword.com to sell and distribute TitanMen.com films via Digital Rights Management (DRM) protected pay-per-download and pay-per-view streaming.
(found here: http://www.gaypornblog.com/archives/000260.html)

to smaller productions, in the words of the discontented porn reviewer:

When you consider it, there are three options when it comes to video content now. You can download the videos, stream the videos, and now there are the DRM videos which you can do either one but you can’t keep them. Where does DRM stand, in my book? Well, I think that DRM is probably the least desirable of the three options for me right now. When you can download the videos, that is the best. You save them, burn them on a CD, and break them out a few months later and its like new porn content without having to pay for a site all over again. Streams are effective too, and thats because you can go on there, watch in your browser and not have any real “mess” left in case you are on a community computer. Also, there are ways for you to save your streamed videos. You may have to be more computer saavy to do it, but thats why there are places like Pornliving to gain that saavy! Streaming movies were originally (and still) meant to prevent people from saving the movies. I think in some twisted webmasters minds, they think that will keep people members longer and save them bandwith. Lets face it, the average membership to a porn site is one month or a trial period. People download all the content, and then move on. You really need something special to stay a member to a site. It has to hit you in a certain way, it needs awesome update schedules, and it needs lots of content. With all this said, DRM just doesn’t stand up to your other two options. There is no trick to get around it (afaik) and that just ruins the whole thing for me. When I pay for a porn site, I pay for the content. I should deserve to keep it, and watch it at will. $40 is damn high for a porn rental, if you ask me, and thats what I consider this DRM business.
(found here: http://www.pornliving.com/rev/765/girlshuntinggirls.html)

Just wait until Windows Longhorn is in every home. That is when Porno DRM will really hit. Macrovision protected DVDs really don’t matter because it can be defeated with a $20 signal booster or an old VCR.