The Social Network star, who is engaged to marry the actress, first met Biel in 2007 and immediately wanted to ask her out - but admits he relied on "a fair amount of tenacity" for her to say yes.
He tells Britain's Hello! magazine, "There was nothing starry about the way we got together - it was very un-Hollywoodesque in fact. We met and got talking, afterwards I asked my friend if I could call her and ask her out. My friend called Jessica and Jessica said yes, and so I called her.
"And yes, I did it the old fashioned way - by telephone. That's something I learned from both my stepdad and my grandfather - that there is a thing called chivalry and it doesn't have to die with the birth of the internet.
"I had to be pretty persistent in order to get her to say yes. But I have a fair amount of tenacity and if I want something I stick to it. And in the end she agreed."