If Mpreg didn't exist how different BL genre would be??

No cus as much as I find Mpreg sorts of like nice but the way most couples are just straight heteronormative or however u call it. Feels straight couple. They're always called mom for no reason! Anyways I keep thinking that maybe BL would be more realistic with having kids and more queer?? I swear I never saw a BL where they do the surrogacy thing. (If u guys have recs send some). But what about y'all? Idk deep thoughts.