VOLUNTARY (This is a very important factor in the moral field!!) sexual relationship between representatives of different human subvariants is not a new thing in Scandinavia, which has a fundamentally liberal attitude. This was not considered a new thing in the Viking Age, nor were several forms of open sexuality. In the larger settlements that served as trading posts, there were also people from other regions, and some of the Swedish/Danish/Norwegian Vikings also traveled and settled in other regions. One of the best examples of this is the case of the Varangians who served as mercenaries in Constantinople.
Ethnically and anthropologically, all areas where migrants arrive become heterogeneous to a certain extent. They also used to go from Europe to other continents to this day. In Nigeria, Rwanda, Kenya and other African countries, a black woman and a white man relationship occurs, but also a white woman and a black man relationship, just like here in Europe.
Human nature has a dual character in several areas. It is both individualistic and demanding of communal life, rejecting and accepting, liberal and conservative, extreme and moderate, humble and dominant. Based on these psychological facts, there have always been and always will be ladies and gentlemen who are strongly attracted to the members of the other group, but at least approach them with cautious curiosity in addition to those who reject them.
Every person is both body and soul, that is, a combination of physique and personality traits.
Now let's focus only on the anthropological characteristics!
A Scandinavian Caucasian ("white") woman and a Congoid ("black") man must find the other person's pigmentation, hair texture, and body structure mutually attractive (finding the facial structure attractive is downright fundamental!!), because sexual excitement is caused by consciousness enhanced by visualization!
You do realize that "Caucasian" and "Congoid" are obsolete racial terms from the 1800s, preached by antropologists and eugenicists? lol.