Now, you’ve brought this up multiple times, please, explain what it is you mean by this, exactly, because the way you phrase has it makes it appear as though pheromones are comparable to a date rape drug, as you have even made that comparison. I can see how pheromones could give you an edge, if attraction exists on some level, but to totally alter another’s type, and attribute it to pheromones, that is unreasonable.
For example, if I am in no way attracted to another person, any amount of sexual pheromones they are emitting, synthetic or otherwise, will not make me want to have sex with them, or make them more attractive to me for that matter. If anything, that would make them less attractive to me. Another example, a women is really attracted to you, but you are totally unattracted to her. Now, lets assume that same women is giving off a very sexual vibe when around you, how do you think you’d feel? 
So, ethics, really only should come into play if that edge, gives you the leverage you need to ‘tip the scales in your favor’. But then, that argument is then, in that light, comparable to using PUA techniques to do the same, and that utilizes psychology, rather than molecules. It’s most certainly how that resource is used, rather than it’s existence, that makes it ethical or unethical, as you, and others, have pointed out. And that reasoning, is why it is comparable to an aesthetic change, such as a suit or haircut.
Dominick