In your words there is the underliying assuption that friendship is worth less than a romantic/sexual relationship for some men. Otherwise the men who find out that their attraction is not reciprocicated won't feel betrayed.

Maybe friendship between men and women is rare, but it exist. By your account: Men were far more likely to feel physical attraction toward their female friends":

If a 30% of men are attracted to their women friends versus a 15% of women attracted to their male friends, would qualify as "far more likely being attracted while, at the same time, being a minority of men who feel attraction. Not just that, but feeling attracted doesn't mean that you would "jump" to date given the chance. Some people might feel attracted and still prefer to keep a friendship.

What I try yo say is, do you value your female friends as people? Do you value those relationships? If you were given the chance to have sex one night at the cost of losing years of friendship, would you take it?

The answer of these question tell us what do you value more. And while I think is good that men who are after more than friendship are open about that, I think it is sad that so few would value the honest friendship offered.

By the way, some women might feel attraction and still chose the friendship over a dating chance which I suppouse would complicate things more for the people who think those friendships are just a cover for wanting more. XD

So I would change your advice for women about not relying on male friends, you might simply ask men (and women) to believe the other when they say "I want to be friends" and accept it means just that. I mean, women who only want to be friends usually say so in a very clear way. If that doesn't work for you because you want more, just act as if she just rejected you and walk away.