“Do they wear socks?” asked Jackson, referring to an item male actors wear to cover the essentials when they go nude in front of the lens.
“Yeah, they have to wear the little sack thing, yeah,” said Williams.

“See, I always apologize first,” said Jackson. “I’ll say, ‘I’m sorry if I do and I’m sorry if I don’t… That generally works.”
Cohen wanted to explore the subject even further, asking Jackson, “Do you typically get stimulated in that way or?”
“I don’t do sex scenes that often,” Jackson clarified. “I’ve only done about three in my life.”
Laughing, Williams quipped, “We found the one way I have more experiences than you.”

Source: EW