Interesting read that discusses the use of sexual defamation in the Icelandic sagas, poetry and laws. I don't agree with him entirely - I think he misses the power aspect of that comes with the suggestion of passive or receptive homosexuality. Nonetheless, it very well researched and gave me plenty to think about. I would suggest that Carol Clover's article "Regardless of Sex" be read in conjunction with the book, as she focuses more deeply on the gender and sex problems.
Clover, Carol J. "Regardless of Sex: Men, Women, and Power in Early Northern Europe." Speculum 68.2 (1993): 363-387.