Do you have what it takes? I'm being serious- most guys think they can do it, but the sad truth is that most men cannot deal with the demands of porn- being able to get hard on command and c*m on command in a room full of strangers. I suggest you watch this brief bit of a documentary just to kind of get a feel of what I'm talking about:
http://www.sexspanker.com/sincit.wmv
Before you even consider it, ask yourself these questions:
1) Do you have the kind of penis, in terms of length and girth, that is easily marketable in porn?
2) Do you have the sexual stamina to f*ck- vigorously, nonetheless- for several hours, with starts and stops, in a variety of positions that may be uncomfortable to you? Are you physically fit enough to go through this and still look relatively sexy while doing it?
3) Are you able to hold off ejaculation? Do you ever prematurely ejaculate?
4) How big are your loads, in terms of volume? Do you usually shoot or dribble?
5) Imagine this scenario: it's you and ten guys in a room. You get fully naked in front of those ten guys, and one of them films it. You get yourself hard without any help or visual aids. You are able to c*m in 16 minutes. You can aim it onto a CD plastic cover without missing it. Could you- being honest with yourself- actually do this, with nary a woman or any porn around?
If you absolutely think you have what it takes, then there's pretty much two ways to get in:
1) Start in gay porn, get noticed for your big penis, ability to get hard and stay hard at any moment, and ability to c*m (a big load) on command, and then make the transition to the straight porn market.
2) Bring a super-hot girlfriend to the biz who will only work with you; then after a while when you get noticed for your big penis, ability to get hard and stay hard at any moment, and ability to c*m (a big load) on command, you start getting work f*cking other girls.
Is it possible to potentially get in otherwise? Yes, but it's soooo rare and very difficult, considering how reluctant most producers are to risk wasting money on a new guy who may or may not live up to his claims. It'd take an incredible amount of sheer willpower, networking, and basically promoting yourself and scouting work 24/7 to become a straight male pornstar on your own.
Whatever happens, good luck!