I'm conflicted about it, personally. I think it can have a positive effect, but at the same time, I've always considered it rude to talk about others' sexuality. I watched a film about Jane Adams and the Hull House movement the other day and it was pretty obvious that the house was run by Lesbians. There were so many hints it wasn't even funny, but the narrator never said it. They mentioned several times that the women in the house were single, education women who did not want to get married. Mentioned which women partnered off with other women and "were close friends for the rest of their lives."
It was interesting to see how much of a contribution to society these women made. They pretty much shaped the social service and social welfare, sanitation, employee rights, child labor laws, women's rights, free-health clinics etc...just so many contributions. I think it could be a positive thing for young GLBT to hear. It would be nice for them to get to claim the people who made the such great strides in social justice. At the same time, who knows for sure if they were lesbian women since it was something nobody talked about back then.
Considering the high suicide rate of GLBT youth and the current fight for equality, I'm leaning towards supporting the law. I'm not sure where we would draw the line though. Which non-obvious things do we need to know about historical figures?