He's using you. I'm sorry but I'll have to shoot it: if you don't get out of there, he will change you into a muppet he control at distance and make you unable to leave. I don't mind the porn thing, but cutting your social life while HE can see HIS exes is not fair. Injustice is disrespect, and disrespect is not love.
Moreover, if you want babies while he doesn't, but however he does want sex with you, means that you have different optinions on important matters, and that will make too much trouble ahead to handle.
From your description to me he sounds like a sexpervert with zero willing of responsiblilities.
You guys don't look like you fit together. It's better for you to break this if you feel it's not your place. You have rights too, remember that.
Just in case you had this in mind: Being afraid to be alone is not an excuse to stay with someone you're not confortable with. If that crossed your mind, forget it. You're better off being alone than being with an egoist jerk.
Screw him and talk about it around you -- maybe that's why he doesn't want you to contact your friends! Because he knows he's wrong with you and your friends would effectively tell you he is...
Good luck.
SK.
