"Is Open an engaging read, likely to promote discussion and perhaps heated debate? Certainly."
"Block skillfully blends her story with research on sexuality, monogamy, adultery, and divorce (sources wisely appended). She makes compelling arguments against the biology of monogamy, argues that our modern configurations are a recent invention (post 1940), and cites adultery and divorce rates of 40 to 50 percent...This honest and compelling memoir should spark a respectful dialogue about the underground status of open marriages. Some readers will feel relief, many will be aroused or curious, and others will definitely be insulted."
"This is brave, brave stuff, colleagues. Buy it. Read it. Love it, if you can."