Regarding asking sexual questions:

First, it's good to not rush into sexual talk. Even girls who are an easy F-close don't want to feel like a whore. Until they trust you, then you can call em dirty names all you want Anyways, rushing into the sexual talk just makes you seem desperate.

I hooked up with a girl from POF just a month ago. After maybe 30 minutes into our first chat she wrote that I really stand out from her other online experiences because I didn't bring up sex. Still she was a first night F-close.

Another interesting thing I've noticed is plenty of girls have in their profile that if you are a guy looking for sex then don't message her. But when I meet these girls it's often an easy F-close.

The best way to get into sexual talk is by getting them to bring it up first. Learn how to indirectly steer the conversation or use loaded words so she has the chance to make some naughty innuendo. Once a girl is ok with the sex talk they do get really turned on by it, but you also have to not over do it, or you will start seeming desperate again.