Every third Swede goes to a tanning salon in winter. You can’t do otherwise - winter in the country is long and quite depressing (although it’s quite warm in Stockholm latitude, and closer to the continent, to Malmö, there are winters without snow). It’s boring without sunshine. Swedish women for marriage especially like to sunbathe before a winter trip somewhere in Mallorca - not to get sunburned. Don’t be surprised if you meet a Swedish woman with darker skin.