I bought my first bottle of Stella McCartney's Stella just before I met my boyfriend, and I pretty much only wear it on weekends, so now putting it on smells to me like seeing him.  I'm pretty sure if we broke up I'd have to toss what was left in the bottle, so let us hope things work out.  For the sake of the perfume.

I also got a bottle of Lovely for Christmas, which seems like more of a daytime scent to me.  Very light and clean.  And not dependent on the success of any relationships for continued wear.
