It just seems clear to me that you and BB are simultaneously fighting about money and sex. What the two of you have in common is that you have an unspoken agreement that whoever is more "conservative" wins any fight. Therefore, you "won" the fight about money and she "won" the fight about sex. I wonder what BB would do if you went out and impulsively bought a mint-condition classic car just like the one the two of you used to "steam up" when you were young?
"Tell me, what is it you plan to do with your one wild and precious life?" - Mary Oliver