William Shatner and Nichelle Nichols William Shatner and Nichelle Nichols

Bea Arthur will be remembered not just for her dry delivery and deft timing but for knocking down television taboos. First in Maude, and later in the Golden Girls, she introduced sex-related firsts that other shows were scared to touch. Here's a look at some of the barriers broken by Arthur and other screen stars.

First Married Couple to Share a Bed: Yes, there was a time it was considered wildly risqué to portray two married people sleeping together. But that time was the hilariously uptight 1950s, not swinging 1947, when the real-life married stars of Mary Kay and Johnny, television's first sitcom, regularly shared sheets. No couple would rock the bed again until the Flintstones.

First Bisexuals: Star Trek's 1967 episode "The Trouble With Tribbles" features Tribbles, adorable fuzzy creatures who reproduce constantly and swing both ways. Some would argue that Tribbles were also television's first Furries. Watch them here: