Girls can lose interest in you if
you're too passive. All you need to do is keep proximity. When you go on a date, sit next to her. Is she having a good time? Great! Lock eyes with her, and move in slowly for a kiss. Once you've been kissing her and touching her all night, always invite her back to your place. Then gradually build towards sex(calibrate your speed based on her response).
I totally disagree about injecting sexual topics into the conversation. Though it's good to be comfortable with talking about sex, most guys who add in sexual themes come off like they're trying too hard and it backfires. You don't really need to talk about sex. Sex is implied every time you're interacting with a woman.
There is really no such thing as a friendzone. There is either attraction is there is not. You are instantly friendzoned if she doesn't find you attractive. On the other hand, you can know her for months and never be friendzoned, because she views you as sexy the entire time.
Have you ever read one of 60 Years of Challenge's books? Chase's book(dude who wrote the article above) is also very good, though a lot more complicated and can lead to some confusion.
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Quote:
Build an emotional connection through your hard throbbing cock.
Build trust and comfort by holding their hands and covertly rubbing your elbows on their nipples.
RSDTyler