I learned this during yesterday's lecture:

'Ethical Sluts' develop new language of love for open relationships by Maxine Frith

Frubble: Describes the feeling of warmth and happiness when seeing one of your partners getting on well with one of your partners or one of their lovers.
Wibble: The temporary feeling of insecurity when seeing a partner being loving or close with another of their partners.
Metamour: Used to describe your relationship with one of your partner's partners.
NRE: Short for "new relationship energy" – a phrase describing how one partner behaves when starting a new relationship with a new lover.
Polyamory: Loving more than one person.