Howdy, I have very good success on POF/OKC with a better than 50% ROI. The best advice I can give on this is pay attention to what she says and return her words to her with sexual overtones. A couple of examples belwo I have been chatting with this HB8 on POF (1st face to face last night)(K close and 2nd meeting gauranteed).
Ex: 10/20/12 - I sent this right after this HB8 said she was going to bed.
Me: Ponder this while you are laying there awake thinking about me: Have you ever noticed how the word "bed" looks like a bed?
HB: Nerd!
Me:

HB: But a cute Nerd
Me: OMG woman, you are definitely not getting enough spankings!
Ex: 10/21/12 - Same girl the next morning
HB: Good morning! You jinxed me
Me: How so?
HB: You woke me up at 5:30, I should scold you!
Me: If I had woken you up at 5:30, you would definitely not be scolding me!
HB: Oh Really? What would I be doing then?!
Me: Cooking me some pancakes!
HB: Hahaha...Really? Thats funny

Me: What, you don't like pancakes?
Ex: 10/22/12 - After our meeting for drinks (1st date per se)
HB: You were right!
Me: About what?
HB: Herbal Essence haha! Seriously!
Me: I knew that!

HB: You are soooo smart!
Me: You're such a dork for even checking LOL
HB: Are you home or text driving?
Me: Home, I don't text and drive...Safety first!
HB: I've never been called a dork.
HB: I've always been the cool chick
HB: I've never been called a lezbo either.
Me: I can still taste you on my lips...
HB: You like lezbo dork lips?
Me: On Tuesdays! (recall humor from the date)
Me: I soo know you're smiling right now
HB: Smirk
Me: Hmmmmm...Doubtful
HB: I was going to send you a picture but I changed my mind
(I didnt reply for 25 minutes)
HB: I had fun tonight. It was nice to put a face to the text. You don't look like your pictures either
HB: Wayyyy cuter

)
Me: Send it! And thank you

HB: It was a picture of me smirking. Not cute
Me: Oh...Yeah don't send me not cute pictures! Haha...
HB: I had a good time. We should do it again soon
Basically any conversation can be sexual if you make it funny and get her emotions churning with some push/pull. Make statements that can be interpreted as sexual on your part, and when she challenges you, take the safe yet fun road (i.e. cooking me pancakes!). She assumed I was going to say something sexual, and when I didn't her internal thinking says "I am thinking about sex with this guy, I must like him". Takes a lot of practice...keep pushing the envelope and be confident. NEVER EVER apologize for a comment you make, stick to your guns! I often tell a sexual girl "I am going to fucking destroy your little girl parts!" and if they challenge me "You are going to do what? or Oh really?" and I can tell I have offended them, I simply say "Yes I am...When the time is right!"
Peace...