When it comes to the hippocampus. (Yeah, you should feel naughty regarding your thoughts after reading that!)
The hippocampus and the limbic system in a womans brain is generally bigger than a mans. This explains why women are more capable of processing emotions into talk. Believe it or not, due to a mans smallness in that area, it takes him seven (7) hours to process complex emotional information. That's practically the whole day!
Let's say (hypothetical situation here, really, this never actually happened) a man and woman have made plans to go to the flea market for the day. Like a date. After walking hand in hand throughout the market, enjoying the warmth of the sun, laughing at little children in wagons and purchasing a new chatski for their home man and woman will stop for a nice dinner and some easy conversation. All this wooing is putting the woman in the mood and the day ends well for both.
The day before said loveliness the man comes in and says "The boys are short on their foursome for tomorrow. I told them I could fill in. Is that okay?"
What?!? Hypothetical man has once again set her and her needs aside to go and play with his friends. Hypothetical woman thinks all the romance is gone from their lives, he obviously doesn't care to spend time with her, he has chosen them over her, THEY HAD A DATE. The night will not end well. Ihopeheishappynow. (Roger that!)
The woman has clearly explained why she is so upset but the man has this stupified look on his face. (Been there, seen that.)
The woman is armed with the knowledge concerning his small hippocampus. And she knows.
He really is stupid.
For the next seven hours anyway.