The previous two posts are correct:
There are two ways to get into porn as a male. You need to find a super hot chick that will only have sex with you at first. This will get you in a few low budget movies for $50-$100 per pop shot. (Girls get $300-$500 starting out for 4-8 hours of work). Now after a while people are going to ask your girl to work with other people (if shes hot enough and can fuck).. now if you have not impressed anyone by this time then you are out. You'll probably only have a handfull of movies (if you are REALLY lucky) in which to prove yourself. These will probably be amateurish flicks like Dirty Debutants, Real Sex Magazine, Filthy first timers etc.
So the other way to get in, and this is easier, is to do some gay porn first. Now this does not mean you need to have sex with a guy. You can start with masturbation videos... basically you masturbating, fingering your ass, maybe using different sex toys. It won't pay much at all, but it can get you work and help build you a reputation. You WILL be asked if you want to do gay porn though too if you are good before they ask you to do hetro scenes. But even gay porn is hard to get into. They look for guys that are muscular, good looking, and most importantly you have to be able to suck a mean dick and take a cock up the ass well. You can't tear up or wince at every thrust.
Now tons of guys want to get into the busines.. TONS. Why do you only see like two dozen or so dudes in the ENTIRE industry? Because its harder to do then you think. When you are on a set with at LEAST 2 other people.. usually 5 or more other people.. and a director is telling you its time to go, you have to be ready. You can't lose your erection when they stop to change lights or angles. You gotta be ready to go in a few seconds or it gets frustrating for everyone involved.. and the more frustrated it gets the harder it is to get an erection! If you can't get it up they will pay you, tell you to get the fuck out, and call someone else to finish what you can't handle. You can pretty much guarentee you wont be working again in that situation.
I guess I should mention another way to get in. Fund it yourself. This takes a lot of start up capital and may not pay off.. but if you have enough money you can pull it off. Basially you make your own shit... the problem is tons of people are trying it now. Ed Powers, Rodney Moore, Randy West... they are the pros who have built their empires.. but plent of other people are trying it on the web..
www.sweetloads.com www.californiapimp.com
To do this you basically hire 4 or 5 women for $300-$500 each. Buy a VERY good camera (at least $10,000) and film at least 4 hours with each girl.. all kinds of stuff. Get interviews, cum shots, the works. Put it together and try to get a distributor to carry it for you. If you can't, build your own distribution company. This would cost a LOT but if your movies sell and get picked up by retail outlets you could be in for a whole new career.
Let me know how it goes.
Brian