SO doesn't jerk it...ever?

I finally got up the courage to ask him what his habits are because I've been curious. He said he doesn't do it. Ever. I asked him about when I was gone for 3 weeks at the beginning of our relationship and he says he didn't. Not once. And never since. I have no problem with it, I expect it. I trust him and don't believe he would lie about it since it's no big deal but is he serious? I thought it was a building block of the male lifestyle. Thoughts, opinions, advice???