I agree there should be more homosexual relationships in BG2 and AD+D. In fact there is a slight cheat that will get you one: start a mulite player game as man or a woman, the delete it the character and make a new one that is the oppiste sex, and wham a homosexual relationship, Please don't ask how I know this.
Haer'dalis does have a realtionship but only with Arie (blonde elf-girly-thing)
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The angel's MIA.