I think the most profound thing I've learned is a woman's interest has a window of time to it, and that window will close up if I'm not escalating things to the next level.

I'm pretty sure every guy knows that feeling of a woman enthusiastically setting up a 2nd and 3rd date, just for the door to close if he was being too platonic and missed her signals.

What is a profound thing you've learned when it comes to dating? Something that's typically not preached here?