I do believe, though, that there are some men who unattractive enough from the get-go that you can safely know that attraction won't grow. I've cut several men off by the middle or end of date 1 just because there wasn't even a vestige of hope for the situation. (I didn't even enjoy talking to him and/or he's just not physically attractive). So I don't like it when friends tell me to give things more time "because it [the chemistry/attraction] can grow." I understand the concept, of course, but I choose which men to give more time or not..