This is a research paper proposing a causal link between child seat regulations and family size.
It is not about procreation in cars, such as the song by Cake - Stick Shifts and Safety Belts. "I need you to be here with me,
Not way over in a bucket seat.
But when we're driving in my Malibu,
It's easy to get right next to you."
Still available in full size trucks, more likely to be found in fleet work trucks though.
5 minutes of googling tells me the 2013 Impala was the probably the last car sold with a front bench option. I would have guessed it would be that or a Crown Vic.
It is not about procreation in cars, such as the song by Cake - Stick Shifts and Safety Belts. "I need you to be here with me, Not way over in a bucket seat. But when we're driving in my Malibu, It's easy to get right next to you."