Jamie Dornan on Visiting Sex Dungeons to Prep for 'Fifty Shades of Grey'

He had to take a "long shower" before touching his wife after.

In fact, he literally went to a sex dungeon in someone's home. He only observed.

“I went there, he offered me a beer, and they did ... whatever they were into," he told Elle UK for its February issue. "I saw a dominant with two submissives, and he became our kink advisor on the film.”

The experience shocked the 32-year-old actor.

“Then going back to my wife and newborn baby afterwards," he continued. "I had a long shower before touching either of them.”

The February issue of Elle UK hits newsstands on Jan. 2.

"Fifty Shades of Grey" hits theaters on Valentine's Day, 2015.