>>519056472 (OP)
There was such a difference in nutrition that knights were often significantly taller and bigger than peasants
Besides, the cleanest and most appealing peasant-level people would be her servants in the castle.
So she would have to get her big, strong, soldiers bring her some scrawny, short malnourished, unwashed peasant instead of one of the presentable looking servants outside her room.
It's a bit like imagining Bezos' ex wife, telling her body guards to fetch some wagie from an amazon warehouse for her.
Men did that sometimes, cause they don't give a fuck what they fuck, plus, most women are generally fuckable, even if short, weak or poor. And unless they're gay, the men required to fetch the hot peasant girl aren't valid alternatives. (Though most bastards in the middle ages would still be produced with maids and other women serving in the castle, not with random peasants. Not to mention that getting your soldiers to get you a peasant girl would not be required, any more than some millionaire today has to force a girl from starbucks to get in his private jet)
>did this happen?
outside of some peasant's wet dreams, no.
cheating and bastards did happen, but not with randos who tilt the fields