In last night's episode of the Showtime series "The Borgias," characters and siblings Cesare and Lucrezia Borgia give into desire and take their special kind of brother/sister love to a dangerous level.

Historically, and throughout "The Borgias" series, it has been rumored that Cesare and Lucrezia, children of the Borgia Pope Alexander VI, were lovers.

In the third episode of season three of "The Borgias," after having a fight with her new husband Alfonso, an upset Lucrezia seeks comfort in the arms and bed of her older brother.

Most women spend their wedding night in the bed of their husband, but Lucrezia Borgia is not most women.

After creeping down the hall to her brother's room, Lucrezia wakes up a startled Cesare. Laying shirtless in his bed, Cesare did not stop his sister from stripping down and getting close.

For two seasons, "The Borgias" tip-toed around the closer than most relationship between the siblings. In last night's episode, the Borgia siblings made love.

"Only a Borgia it seems, can truly love a Borgia," says Lucrezia. "Why deny yourself a pleasure for which we're already accused?"

Francois Arnaud plays Cesare Borgia in the Showtime series "The Borgias." He sat down with RedEye and spoke about the incestuous relationship between Cesare and Lucrezia (Holliday Grainger).

"It felt like it was meant to happen, Arnaud tells RedEye. "Of course they do have sexual feelings for one another, but it mostly comes from a deep, deep love."

Arnaud spoke about how he played Cesare and how he and Grainger first handled their roles. He said from the beginning the sexual tension between the two was written all over the script.

"It was funny because I remember when we first got there three years ago. When we first got to Budapest, my first rehearsal was with Holly. It was for our very first scene together. We were lying in the garden and Neil kept insisting that we had too many innuendos or it was too romantic or too sexual. And we both argued that it was already all over his writing," Arnaud said to RedEye.

He adds, "It was like there was nothing else to do. So we kept asking, "Do you want us to play against it?" Instinctively that's what came to us, and that's what worked. We had arguments, really big discussions about it in the first year, and he said, "Well, we don't know if that happened. It could all be rumors."

Arnaud continued his interview talking about all the different emotions his character feels after sleeping with his sister.

"It's definitely eating him. There are different kinds of love and when you love someone as much as Cesare loves Lucrezia... I don't think he has many personal regrets about it. But I think for her especially he feels like he should be the bigger man. He should lead her the right way. And he probably feels that he failed her in a way."

Arnaud concluded the interview laughing about how people can seem "prudish" about certain things and ratings for TV shows and movies. His laughter was in response to the interviewer's question, "What would you say to those viewers who might stop watching because incest is not best?"

 "Is incest worse than murder? People can be so prudish."