I've known a few ppl who couldn't have kids but eventually did.
I've known several ppl who thought they were infertile. or were infertile. some took over 5-10yrs to have kids.
I knew someone who tried for years and couldn't get pregnant so they adopted. Then she got preg.
Something no one ever talks about because its a sensitive subject, but yeah it can be pretty common to suddenly have a kid after years of infertility.
But i really dont think all that sleeping around matters. First of all. I believe it was just for work not for play. If he stopped, he would have to look for a new job.
Also the alpha already knows the omega isnt pure. It doesnt bother him. Most likely it will be left in the past so they can move onto future plans
This piss me off. So he slept for money with so many people, AND WITHOUT FUCKING PROTECTION as if stds doesn't exist, only to get pregnant with his love in the end?? Oh, I'm so fucking sure that Jin's elite family wouldn't mind having a son in law that was a prostitute... ヽ(`Д´)ノ
Tbh, if mangaka wanted proper angst, they would make Minato pregnant with some random customer. That would made it worthwhile reading...

spoilers ////////
ngl i dont like the spoilers that they have a kid in the end cause like that makes the fact that mc slept with tons of random dudes while he's in love with jin even sadder sdfgdsf. like at least if he had stayed infertile, it'd be like "ok, ya i get why he was so self-destructive" but then making it so that he actually CAN have children is like .... so we did all that for what???