I have no idea.

But ignorance has never prevented me from talking about something.  

Here's my theory...

I think heated arguments trigger basic emotions similar to the fight or flight syndrome.  Our bodies get pumped full of adrenaline, heart rate and blood pressure rise, and our reflexes spike.  Then after the problem is resolved, our bodies get flooded with oxytocin and endorphines and other stuff.  That's all chemical.  

But the emotional is equally important.  As the offending problem is resolved there is a feeling of intimacy - which feels like "starting over" or renewing the relationship.  There's no feeling as invigorating as hope is there?

Women seem to be most uninhibited in bed when they feel emotionally connected with their partner.  And the "starting over" is a good signal to the woman that there is some commitment on the guy's part.  It may be unspoken, but even trying to keep the relationship going is a commitment.

And speaking as a guy - I think we're just happy and relieved to be getting laid again.  Lol

I've been in a relationship where we fought like cats and dogs.  And the sex was fantastic.  Most of it was makeup sex as you can imagine.  It was an emotional rollercoaster but those post fight sexytimes were phenomenal.

On a side note guys (and gals probably) say "crazy in the head means great in bed."  I imagine some of the same mechanisms are at work here.  Someone who is emotionally uninhibited (maybe not in a good way) is likely to be sexually uninhibited as well.  They just don't care what the world thinks of them...  so why not have fun?

I'm not a fan of BSC gals, but - look on the bright side...  she very well might be an awesome lay.  

Great question!