How do people feel if a 21 year old had sex with a 16 year old? Let's say they are in a relationship?

Women for ages have been getting married around the age of 14 with 20 year olds and has been morally acceptable until the education system was implamented because women can get pregnant and have to quit school. It is a government efficiency law to make the populace have greater education to stay ahead of other countries as well as population control. Because people are living longer lives now and if people were still having kids around 14 we would have a lot more people to deal with. So now people generalize the moral as if it is something disgusting when medical and past time knowledge say other ways. Reproductive organs are fully developed in women between 11 and 14 in and in males between 14 and 16 (In most cases). And the urge to have sex starts during puberty.