First things first, is it something you'd want your mother to know about? If so, that's a good start.
Chances are that even if you do get a casting session or a demo, you won't have much choice in who it's with, male or female. I know straight guys who've ended up fucking or being fucked by guys just for a casting. If you want to get into the industry, you've pretty much got to be prepared to do whatevery the producer/director wants, whether that be having sex with someone you find repulsive or attractive.
It's not like setting up a camera in the corner of your bedroom to record your latest conquest. You'll usually have a full crew watching. That ranges from 2-3 people for a very small production up to a dozen for the larger ones, all of whom will have seen pretty much everything before and who don't tend to hold back on the comments and criticisms if you're not fully confident about what you're doing. It can take hours to shoot a scene, and you've got to be able to stay focused and ready to go at any point. The director may decide to change the lighting for a different camera angle. That can take 20 mins or more until they're happy with it. Then you'll be expected to carry on from where you left off, so you've pretty much got to be able to get it up at a moment's notice, stay hard for ages without coming and, if you can come on command, that's great, but if they've got all the shots they want apart from the money shot and you keep them waiting at the end, they won't be too happy.
So, to sum up, when you're startint out, there's bugger all money in it for guys unless you do gay porn. You've got to be prepared to fuck or get fucked by pretty much anyone or anything and you've got to really love yourself because you'll need all your confidence on set.
Still want to do it?