What makes you say that? Most guys, especially moderately to very successful ones, don't have time to date around, even if they wanted to do so. First two-three months I'd agree with keeping it non-exclusive, but there is zero chance I'd ever have committed to marrying a woman who hasn't shown she can commit pre-marriage (been married for nearly 12 years so mute point at this point, but my wife and I went exclusive dating after 2 months and I proposed a bit after a year)
I don’t understand your response. Why should an expectation be different for men and woman?