Second GL (Hal Jordan, from the movie) is still very much straight. It’s the first GL (Alan Scott, who didn’t originally have a green costume) that they turned gay.
Funny enough, it was the supervillians that they started to make “that way inclined”. Mystique (X-Men villain) was one of the first ones they did that with; her and Destiny, apparently.
I won’t even start with what anime did even way back in the day.
I think it's more that the comics were more willing to hint at lesbianism than at male homosexuality, for obvious reasons (the target audience was teenage boys, for whom the idea of two chicks going at it is "HAWT!" but the idea of two dudes going at it is "EWWW!").
Not Gay!
Gay
Lesbians are not fantasy material.