Uhhh.......what made u think the only reason ppl have sex is for the purpose of reproducing? Even if this is based on historical setting, we can clearly see how he is smitten with her and there's this thing called "physical needs" too
Technically they eloped, so most likely it's just for formalities. And Allen promised her a grand wedding, so most likely they're waiting for the official ceremony just to show how strong their relationship is
Is this on Hiatus?
I wanna know too ;-;