The ones you came up with are quite weird, sorry mate. There are quite a few ways you can turn the conversation sexual...
On the opener, use a direct opener. Don't compliment her on looking "interesting" or that she "has a good energy" or any of that bullshit. Even thought loads of people tell you not to, compliment her on her looks, she knows that's why you've approached her anyway. This is the easiest way to sexually frame a conversation, since she knows you're not approaching just to make friends, you're approaching because you're interested in her.
Misinterpretation is easy to use. Basically just misinterpret whatever she says as being sexual e.g:
Girl: Fuck you!
Guy: Hey hold on, not so fast! We only just met! What kind of guy do you take me for?!
Girl: I need to go to the bank
Guy: Excuse me?! You want to watch me wank? You're very forward aren't you? I've only just met you...
You get the idea. Just use whatever she says and twist it. Also it's always a good idea to make her out to be a big perv. Anytime she says anything that could be misinterpreted as above, just tease her for being dirty minded. Play the innocent victim as girls usually do, but do it in a playful way that makes it obvious you're just taking the piss:
Girl: Fuck you!
Guy: Fuck me? Is that all you women think about? OMG! I'm so tired of being seen as a sex object... I'm not just some mindless piece of meat, I have feelings too you know?! You women are all the same!
If you have the balls you can just tell her straight exactly what you want. Say if you feel the conversation is getting a little bit boring, but you can tell she's into you, just say something like:
"this is getting boring... when was the last time you got fucked properly?"
It will probably shock her, and it creates loads of sexual tension. Also shows you a lot of good things - sexual confidence, non-judgemental... All the things you need for an SNL. Then the conversation will probably move to even more sexual topics. Sex is actually one of the best topics to use since EVERYBODY has something to say about it.
Hope this helps
