National Enquirer (September 20, 2010) has outed Parsons, albeit in a rather nice way. The do it so cutely it's more of an "awww-ting" than an outing. On the same page as a nasty story about Bethenny Frankel cheating on her first husband, NE runs a piece on how Parsons and his partner of several years, Todd Spiewak, are allegedly going to get married.
It sure beats: "BIG BANG'S BIG SECRET LIFE!" or something similar. Cute couple!