The ghost of Duke Ellington claims Freddie Mercury and Antonin Scalia were both gay. Freddie Mercury was bisexual, having relationships with men and women. Scalia never showed any inclination of being anything other than straight. (It's possible the Scalia claim was intended as a joke, but the Freddie Mercury claim is a common misconception.)
Andrew says that Nick was his first kiss, although he was kissing with Missy in the first episode.