“Downton Abbey” isn’t known for being overly sexual. Due to the 1920s setting and its home on PBS, even the most salacious scenes are still pretty tame. That’s why it’s shocking when characters openly discuss sex. It’s even more scandalous when it’s the most conservative characters. Mr. Carson (Jim Carter) and Mrs. Hughes (Phyllis Logan) will apparently have a frank discussion about their sex life before getting married in Season 6.

“As we launch into Season 6, there is the delicate negotiations about what is going to happen when we go up those stairs to bed,” Carter told the Wall Street Journal.

The humorous storyline won’t just involve Mr. Carson and Mrs. Hughes. The two will bring in Mrs. Patmore (Lesley Nicol) to help them communicate. “It’s done with a great deal of humor, but very touchingly,” Logan added. “To again not give too much away, obviously it’s a conversation that Mrs. Hughes feels she couldn’t personally have with Mr. Carson, but she’s engaged the help of Mrs. Patmore, the cook.”

The butler and the housekeeper have always taken their relationship very slowly. After all, it took them five seasons to get engaged. In “Downton Abbey” Season 6, fans will finally see them walk down the aisle. However, their happily-ever-after isn’t guaranteed. When asked if Mrs. Hughes and Mr. Carson would be happy together at the end of the series, Logan refused to spoil it. “I can’t really reveal it,” Logan told Parade. “But I feel that there’s potential certainly. Great potential -- if only he would, you know, buckle under.”

No matter what shocking moments lie ahead in the final season, all the actors seem to agree that it’s a nice ending that will please fans. “It’s beautifully wrapped up,” Michelle Dockery (Mary) told Vanity Fair. “It’s remarkable how Julian Fellowes has crafted it for each of the characters.”

British viewers will see the ending before U.S. fans. While all episodes but the series finale have already aired in the U.K., U.S. audience have to wait until Sunday, Jan. 3, for the Season 6 premiere on PBS.