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you and I can both see that there indeed does begin to seem like a justifiable reason as to why women in the past took their sweet time getting to know a guy.
Even the most playerly man eventually betrays himself. It is women's prerogative, when they do use this method, to play with the man to get him comfortable enough to have him let down his guard and be himself. Good men cannot fail at this, they shine eventually, but the bad ones inevitably scram or expose themselves.
Sure it takes time and effort on women's parts. And frankly women today make that calculation in their heads: "Tonight I could have sweet sex with a guy who will forget about me tomorrow, or else I can spend lots of quality time with a so-so guy, get to know him and possibly turn it into something more". Over time, the one night stands take their toll, the girl becomes used to the lovelessness and harsh towards all men (she herself only having bothered to indulge the very men she tried to avoid at one time).
You want EASY? There is no easy.
Really, what do you women need from us men anyway? You have our sperm, our bankrolls (thru the sperm cooptation) and our attention when you need it. Do you really require a stinky man in your bed every night for the next 20 plus years? I think a lot of women have betrayed THEIR OWN lack of love for men in this manner and concluded that they prefer some combo of serial dating, one night stands, and being alone to being with one same person for decades, as loverly as he may be at first.
Men largely still do not have an equivalent option, which renders us second class citizens (but that is MY pet issue, not necessarily germane to THIS discussion we are having).