I'm in the process of constructing a fantasy world that resembles our world and is predominantly inhabited by humans just like us, but which also contains ogres. The ogres in this world are between nine and ten feet tall, green skinned, semi-sentient and nearly always humanoid, although they have a higher chance than we do of having different numbers of limbs, eyes and fingers. The ogres cannot understand magic, but they have magical properties. Effects of these magical properties include great resilience and the ability to mate and crossbreed successfully with humans and other species. Ogres can communicate and understand simple instructions. They can be kept in human societies and made to work as unskilled manual labourers or security guards. When male ogres mate with human women, the offspring are called ogrillas. This mating process has a magical effect on the human mother - some magic transfers to her and boosts her general constitution and her fertility, and it guarantees that her pregnancy and the birth will be easy and risk free and so will all her subsequent pregnancies and births from then on, whether her subsequent babies are pure human, ogrilla, or other hybrids. Ogrillas are intermediate beings - seven to eight feet tall, green skinned like ogres, but otherwise much more human-like in appearance. They are smarter than ogres but not quite as smart as pure humans. They mature physically faster than human kids and are easier to raise. When they grow up, they are able to breed with humans, ogres and other ogrillas.
The question is, could it become socially acceptable or even a social custom in any community for a human woman to have one ogrilla child before marriage to get the magical benefit and guarantee that she will not die in childbirth and that the children she has with her husband all survive as well? So I was thinking if the women in a community each had just one ogrilla child when they reached adulthood - there would not really be a stigma on individuals being single mothers if they were all single mothers. It would not prevent them from getting married. I'm certain something like this would never catch on in every human society and that there would be humans who would look down on societies or communities where it is practiced. The question is just whether the premise holds up as a possibility for certain communities.
Edit: The question applies to the same world both as it was in pre-industrial times when childbirth mortality rates would ordinarily be very high indeed for both non-magically enhanced mothers and their babies, and in later times of improved technology and prosperity. I think that if such a custom could begin in pre-industrial times then it could continue through force of tradition. The magical effects of having once mated with an ogre mean that a mother would never die in childbirth even in a pre-industrial setting and that all her babies, human or ogrilla, would have a much higher chance of surviving the infant years.