Not to nitpick, but I'm gonna nitpick:
A. There are no gay relationships in Baldur's Gate or Baldur's Gate 2, by default. They have to be enabled with a 3rd party tool that strips out gender check for those NPC conversations.
B. Bioware didn't even make the original Baldur's Gate.
C. The first gay romance option in a Bioware game was Liara in Mass Effect in 2007. The first gay male romance options in a Bioware game were in Dragon Age in 2009.