If she's into receiving cumditioning, she has to be pretty liberal in her view of relations, or at the very least, quite excited about letting you pleasure yourself with it.

Believe me there are a ton of chicks on FetLife, who are into every kind of kink you can imagine, who go absolutely frigid when talking about blowing a load on their hair. The benefits are not well understood, only by a small number of people, we long hair guys need to spread the word on how beneficial it can be.