Right... so she is, or at least used to be, this really wild, reckless character, while you are straight-edge and maybe a little uptight... I don't know, at first sight it doesn't sound like a match made in heaven, but only you can decide if it works, and you seem to believe it does. Very well. So on to your questions:
- normal women should love all their children equally, and anyway I'd find it really weird if she'd favour the product of one drunken sex night that she adopted out over your eventual children;
- I think only she will know that. Perhaps she took that lifestyle because of some deep issues in her past (earlier past that is), or she was just kinda crazy back then (no offense). Can't you talk with her about this?
- God no. You seem to be a good guy with all the right ideas, just do what feels right to you. No need to be extremely uptight either, but don't go out smoking, drinking and partying out just because she does/did it. You don't need to do these things to be happy. As cliché as it may sound, be yourself man.
(disclaimer: this is just my opinion. I'm really inexperienced in love issues... bleh)
Time to stop complaining when there is no reason to. Life's good, man.