She never had sex with her husband true, but she did use his DNA to create Ain to her specific tastes, ie; the first King of Ishtalica. She, ehem, extracted the needed materials from Logas while he was under her spell and created Ain using a part of her roots. Think of it like cutting a sprout from the base of two different but similar trees/plants and planting it to create a hybrid, my mom used to do it all the time with her rose garden. We'd end up getting bushes that would sprout different color flowers, it's called grafting.