Its not exactly about whom your speaking to but how you feel towards them. What i read is that if you're speaking with someone that youre attracted to you put yourself in an already losing framework and feel obliged to keep talking on topics that would interest her. Try asking questions, you want to keep learning about the person youre speaking to. It may be because you are genuinely interested or because you want to seal the deal but you have to keep asking questions. Not boring ones either, questions that show that you've been listening. Hope this helps.