There is a saying that you can't discuss tastes and desires. I can't recall it in English.
In your title you pretend to know what males think. I suppose your suggestion is we, males, are all drooling now reading your post.
Well, as a male, I am not. This type of 'dare' is just not my kind of taste. I suppose I am more on the 'softer' side of tug's or whatever I should call it. I like tug's to be playful, but then again the meaning of 'play' might differ from person to person. For me your challenge feels more like a permanent humilation than as a play.
No offense though when this challenge is your taste.
It is a pity you lost a buddy. Still I can see why she might feel insulted. I am not saying every girl will. I am just saying that not every girl, even when addicted to tug's, and not every male is sharing the same kind of excitement. To me particulary tug's require mutual understanding and scanning each other desires. If she didn't accept the challenge I guess you didn't scan enough.