For best friends, your conversations sound very formalised.
Regarding the topic however, it's really hard to say. I'm not a guy for one thing, but I can say that if I'm romantically attracted to someone, I usually avoid talking about love, sex and all that jazz in front of them. Then again, I see girls who do it deliberately, to provoke a response from a guy. I guess a male's point of view in this matter would be more useful.