Sexual Orientation

We have a push to amend the New Hampshire constitution to guarantee equality (or something) for "sexual orientation".  Not sure just what sexual orientation means.  Is it a new word for gay, lesbian, bisexual, and transgendered?  Actually I, and everyone else, assumes that anti discrimination laws already on the books covers them.  Or is it a term that just covers boys who want to be girls and girls who want to be boys?  And what equality does it offer?  I can understand requiring equality in things like college admissions, apartment rental, hiring.  But what about more intimate jobs such as live in house keeper, day care provider, or nanny?
Apparently the NH senate has passed the amendment (dubbed CACR 17) and it's now over at the House. 
   I'm dubious about the value of this one.