Season 2 of The Americans premieres tonight at 10 p.m. on FX. According to its stars Keri Russell and Matthew Rhys, this season will be even sexier than the last.

Russell's role of Elizabeth Jennings, a Communist spy who often gets hot and heavy in the show, represents one of her most mature performances yet. According to the 37-year-old actress, she likes the change.

"I enjoy the vulnerability and sexuality of her and [am] continually interested in mining the relationships," she said in an interview with The Argus Leader. "...The good thing about the sexuality in the show, at least where I'm coming at it from, is there is a gift in it not having to be this big sweeping romantic movie where you have to be so in love, and so beautiful and so sexy. You're usually using the sexuality, at least in the spy end of it, to get something."

Russell told TODAY that tonight's season premiere continues the steaminess of season 1 and features "some incriminating scenes."

"We start this season, there's a much more unified front with the marriage," she continued. "The marriage is very real now. If last season was sort of a metaphor on marriage and how complicated it is, I feel like this season is a metaphor for family, keeping outside forces out."

This season, Russell's character will deal with Rhys' Henry Jennings's questionable loyalty.

"It's a great dramaturgical device," the 39-year-old actor said in an interview with Toronto Sun. "Phillip realizes there is no longevity to the life they lead. They're not going to return to Russia with the kids to live in a Communist paradise. He wants to see his children raised as Americans. He wants to secure their futures.

The Americans may feature a lot of sex and drama, but in the end it is a show about Elizabeth and Henry's relationship.

"To me, it's about a marriage," Rhys explained. "It's a marriage with a phenomenal amount of baggage, but to me, it remains a show about a relationship with a drop of espionage. That's what the attraction always was to me, how that relationship would unfold."