Sarcasm is an adjusted stress reaction.

Forgot to respond to this, but when I was in B5 fandom (at the time I was strictly in analytical boyfandom so my experience of fanfic written while the show was on is limited) my understanding is that the big fannish ships where the two canon hetships: John/Delenn and Susan/Marcus. I don't think there was very much Susan/Talia at the time.

Susan/Marcus seems to get much less fic now. That might be because it's a very conventional hot boy/hot girl ship and the people who used to write it were immature writers who didn't have a lot of commitment. Or it might be because the incredibly creepy post-show short story JMS wrote about them put people off the ship.