Nice post!
Do you think seductiveness is a kind of power which can give someone an unfair advantage?
--> So, it is not unethical to try to increase your genetical fitness (we have 2 x more female ancestors). The sexual selection is very hard on men, and in my opinion they should have the right to use any tool at hand to improve their attractiveness. I think the renaissance of seduction (it is an old art) is that it is difficult for young men to pinpoint the selection mechanism. In a postmodernist female driven society, study and get a job is often not enough anymore.
Do you think seduction as a whole is ethical or unethical?
It depends of course.
If you think seduction is ethical what are the rules to follow to make sure it remains ethical and does not cross the line?
If you hypnotise someone to act against their free will it is unethical (an illegal). Women often complain that they want to met a man that has the guts to stop them on the street and that things happen by serendipity. But when men do day gaming and hone their skills it is often viewed as manipulation. The threshold should be hight for calling something unethical. Most women want to be seduced too.

Also, women have most of the sexual power in the world, so that women are even in the workforce will lead to a lot of positive discrimination. Some women sleep their way up the ladder, but it is taboo to talk about it. That is unethical seduction in my opinion.