If 10.2% of LGBT folks are married to someone of the same sex, and 13% are married to someone of the opposite sex, then how is it possible that 90% are not married to anyone as this editorial claims?  That adds up to 113.2%.

Remember that LGBT does include bisexual people, who might fall in love with someone of the same sex or the opposite sex.  It also includes transgender people, which seems odd to group together with others for the purposes of this question.  And finally, it includes people who got married to someone of the opposite sex before it was legal to marry someone of the same sex.  I have a friend in this situation; he doesn't believe in divorce, and is committed to staying with his wife even though he's gay.