Chemistry

I review books. The last batch have been romance novels. This one this week has been all about chemistry.
The way the butterflies spring up on us when we've meet someone we really like, or how we react when we kiss someone for the first time.

This got me thinking.  Thinking about the last time I had real butterflies because of a man.
It's been years.  I've had too many bad attempts at relationships/one night stands, and way too few butterflies because of them.

Let me ask you, what do you do when you don't ever have the butterflies?