When Stephen Hawking was asked why he was instantly attracted to his new girlfriend, he said, "It's simple, she pushes all the right buttons."
Stephen Hawking's Attraction
Explanation
This is a pun using the phrase 'push all the right buttons'. It's used in two ways: in a literal sense, referring to the buttons on Stephen Hawking's wheelchair/communication device, and in a figurative way meaning to have a good romantic chemistry with someone.