i was not quite happy with his visualization. so i redid it, here it is:
i hope it is self explanatory. in case it is not, here is how it works: the series starts in the center of the circle. each season has a ring around the center (season 4 on the outside). in case of a relationship (relationship, sex) between characters there is a line for each character which corresponds in color between the characters. e.g. Shelodon and Amy have a long relationship in season 4. the shortest lines are relations that only occur in one episode. double colored lines show a dual relation for that character.
let me know what you think in the comments.
i’m mirroring the data here (actually it corrects missing entries i found too).
edit 110702: there was an error in the dataset. i corrected that and updated the graphic (v1.2)
edit 110707: there was another missing entry in the dataset. i corrected that and updated the graphic (v1.3)