I could wrong , before the threesome took place that night , If you seen that guy left for a while maybe 1 or 2 hrs and Eva left maybe the same length of time. Eva cam back , and the that guy came back about 20 mins later . that's what I found odd . like they meet up before some where before this all took place . If you can read between the lines there was a lot more going on with Eva and that guy , a lot of intimacy going on hiding and kissing alone smoke deck , and how they were looking at one another in the kitchen before that guy left and this was going on when sam wasn't looking . I think they know each other more then you think. I watch the replay 5 time there is more to the story then what leed's on