A lasting relationship is about commitment. Reading the description of their relationship it's clear there is no commitment, except in the financial sense. As such him reimbursing her for the income hit she's going to take by taking time off to have a kid is both fair and makes perfect sense. But then they should also address what to do in the event that she decides to put her career on hold to stay home with the kid. In that case, surely, she should be paid for the work she does. And what's a fair wage for a Mom these days? But what if, instead, he decides to stay home then what should he be paid? Gee this gets complicated fast. It would be much easier if he just kicked her to the curb and started banging bimbos instead. Cheaper too. And if he wants love and companionship then get a dog.