The Vikings wouldn't have had wives who were not sexually developed - and that would have meant they'd be around 16 or over, as puberty occured later than it does today. The ancient Germanics waited a long time before pairing off, generally around age 20, as they felt to do otherwise would stunt their growth.
In Viking marriages the approval of the parents and of the bride were given first.
Viking rape during raids may have happened with the odd rogue individual, but the whole rape thing is actually Christian church propaganda and not to be believed. Vikings did not come from a rape prone country and they respected their womenfolk.
"Orgies of rape originate in a culturally ingrained hatred of women that is acted out in extreme situations." It would not be possible without feelings of hostility towards women.
"The oft-repeated thesis that the purpose of this is first and foremost to take revenge on the enemy accepts, for one thing, that women are "war material", and is, for another, refuted by reality. The victims of rape in May and June of 1945 were not only Germans, but also Jewish women who had survived the Nazi terror, and women from Eastern Europe whom the Nazis had used for slave labor. In Kuwait, too, the women raped were not exclusively Kuwaitis, but also immigrant workers from the Philippines, Egypt and other countries. Susan Brownmiller draws the conclusion that women are raped in war not only because they belong to the enemy camp, but because they are women and as such are enemies (Brownmiller 1978:69)."
http://www.wilpf.int.ch/publications/1992ruthseifert.htm
Vikings did not have this kind of attitude towards women. Many other cultures were and are inclined to this culture of hatred towards women, although to hugely varying extents - by now it has spread to affect every country far more than in the past -perhaps that is why people find it harder to believe the Vikings would not feel that way.
south park