Question About Jérôme, king of Westphalia's Heirs

If I take a look at the Bonaparte family tree, I notice something rather peculiar. Jérôme's kids by his second wife were all born after the Empire fell. I know the marriage between he and Katharina of Württemberg was pretty one-sided, the guy spent his wedding night socializing with Stéphanie de Beauharnais. Katharina was in tears the next morning and complained to Napoléon who then admonished his brother. But when the king of Württemberg tried to persuade his daughter to leave Jérôme after the Empire fell, she refused.

Kat was already "older" by the time of the marriage (24yo), but her first kid only came along (like sister-in-law Elisa) after there was nothing left to inherit. Was it simply Jérôme's indifference? Or was there a problem? His first recognized bastard child came along in 1811 - presumably after trying, and they continue in a steady stream until 1813, when they dry up once Katharina's preggers (the next bastards are only in the 1840s, after Kat's death) with their first kid. I'm not saying Jérôme stopped philandering once he knocked his wife up (the king of Württemberg regarded him as a wastrel and refused to put his daughter Marie through a marriage to the Prince Royal for fear of repeating the same folly), but why did it take so long for him to get her pregnant in the first place?
 
Could be anything, from incompatible fertility, his attraction to her (i.e. harder to have sex), even status (apparently women are more likely to get pregnant from higher status men), etc.
 
Could be anything, from incompatible fertility, his attraction to her (i.e. harder to have sex), even status (apparently women are more likely to get pregnant from higher status men), etc.

I think we can perhaps rule out incompatible fertility, since their 3 kids were born reasonably on top of each other (nothing for the 1e seven years then bam a boy in 1814, a girl in 1820 and a boy in 1822) - okay not THAT on top of each other but you get what I'm saying.

Could be his attraction to her. I've read that she was stouter and a little on the short side which made her look dumpy (but this is a description of her from post-1815 AFAIK), so I don't think ugly was a word to describe her, but probably just plainer than Betsy Patterson or Stéphanie.

Either way, there have been enough kings married to, as the French ambassador describes it to Jeremy Irons in The Borgias "two bag women. One bag for her head and one for yours". That didn't seem to have an issue.

Surely Napoléon wouldn't have cared about something as simple as this (and would've told Jérôme this)? She's cousin to the czar and the Bonapartes' sole royal link before 1810 (the other links are through those hated Beauharnais and the Tascher la Pageries). Jérôme can't have been let off the hook even if he whined about her plainness, could he? And if he found her so distasteful while he WAS king knocking her up once he ISN'T doesn't really make sense. She refused to leave him and her dad/brother wouldn't pay her allowance unless she did. So IMO Jérôme would've had LESS reason to cohabit with her once the crown was off his head, or is my logic in this ass-backwards?
 
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