I think we're all making different arguments here. You guys say that women shouldn't get preferential treatment. I agree. It should not be compulsory to let a woman have your seat. However, it is a nice thing to do. It's coming across from your side that you don't like the idea of being nice, although I think you're just trying to make the point that you souldn't be expected to treat girls differently just because they're girls. In which case, yeah, I see your point. So because we all think we mean something else, the debate continues.
In the long run I think we all agree. Maybe.
Flux's argument is that he would and other men should give up their seat to a woman or allow a woman to take the last seat if only one was available out of sheer politeness and just because it is a woman.
I don't know how to see that as anything other than unwarranted preferential treatment.
kimc, An Officer and yourself, whether you advocated it or not, suggested that doing so can make a man appear more attractive in the eyes of the person receiving the seat. An Officer also suggested that men will only do it for attractive women. I am lucky in so much that I no longer have to care whether some strange woman I'll never see again thinks I'm attractive or not based on how willing I am to have an unnecessarily uncomfortable Tube journey.