I had said months ago that I thought this entire bunch was ready to start introducing people into the mix. Serena is always having sex with different guys but the two of them never party with the whole group. It's either Serena and the rest or Serena and the new guy. Edda and Joe are bringing in new girls but none of them want to do anything sexual.
As for the first part, I will always like this group (Edda/Joe/Nina/Alan/Serena) but I like unpredictability more and I'm not the type of person that continuously hopes for something to happen that I know will never happen. So while Edda/Joe/Nina/Alan will probably do the group sex thing after another hour or two, I will watch more than likely put my attention to the party at Anna and Alex's place because there's no telling who is going to fuck who tonight.