How do you avoid women from getting the topical finasteride on them when you use it?

I’m excited for this stuff too, but what I wonder is what are the risks to women since this is a topical formulation. The pills arent supposed to be handled by women who are trying to get pregnant. So what about the risks from the topical solution? Is the concentration high enough to cause an issue? What about it rubbing off after its applied (if the woman runs her hands through the hair etc.)? Wish I could see a discussion on this aspect of it.

This is a problem, of course. Application in the morning and then going to work, washing your hair in a shower when you return home is one way around this potential problem