Start at 16.30 minutes... three different brain systems and why we can love more than one... also why casual sex is not always so casual.
This whole clip is interesting to me, especially the part at 18.08, where she talks about what anti-depressants are doing to our ability to love!
At 3.30 she talks about how we become pocessive when we are in love. When we aren't so much we don't really care that much if they are sleeping with others....
Lots about NRE here!
This is worth a whole listen, but hopefully the times indicate some of the most valid points.