I have to chime in with a caveat here. Thinker had a) pretty much accepted the likelihood of divorce and b) laid down the law with his wife...
There is a path that lead to that moment.
At least in my sitch, that wouldn't have worked in and of itself.
Yes there is a path that led to that moment. He had a good enjoyable evening with his wife in a relaxed environment, they probably flirted with each other a bit leading up to this, subtle looks, maybe the occasional touch, smile, good conversation, they were comfortable with each other. Thinker was confident, he displayed it with his body language, she was receptive which she communicated with her body language, he tested the waters before hand so to speak to see if he was on the right track, he rec'd some more hints & clues along the way and gave some more of his own: he pursued her, stopped a bit, pursued her again, etc.
He didn't force her and he would have respected her if she did in fact say NO and meant it wholeheartedly.
He listened to his instincts and he was rewarded with his wife's affection accordingly and I'm sure something inside of her really enjoyed this aggressive behavior on his part, something unexpected, something exciting, something maybe she's been missing for quite some time.
Does any of this make sense or is it all rubbish?!