Really? By including this one statement you made me think you are part of the nationalistic right.
Sweden's "rape epidemic" is mostly because other countries under-report rape. If a woman comes to the police and say that her husband had raped her almost every day for a year, then that's 300+ rape reports. Other countries might report that as a single rape report, or declare outright that it's impossible for a husband to rape his wife.
See for examples http://www.geocurrents.info/geography-of-crime-and-punishmen... and http://www.bad-housekeeping.com/2013/12/01/sweden-gender-par... .
There are certainly people who argue that this isn't true, but that analysis is not simple, while you argue that it's "not difficult".