Hi Belundia, welcome to PheroTalk! 
I don’t have sensitive skin myself, so I can’t tell you my own experience, but from what I’ve read in the Womens’ forum, pheromones from Androtics Direct (the site this forum is linked with) generally don’t seem to make you break out in anything. I think there were a couple of exceptions, if I remember correctly, but what I recommend is reading some posts or journals written by other women with sensitive skin. A quick search should do the trick!
How long the pheromones last depends on the pheromone, how and what you’ve applied them with, and the weather. The general range seems to be 4~9 hours but there are ways to make them last longer or reach further, of course.
For your last question, I’d like to direct you to this stickied thread. 
And YES, they do work on women!!
Welcome once again, hope to see you around.
- Spinach