If you think women need to shave underarms, you should be doing that yourself --- it doesn't look ANY better on a guy, newsflash!
But I'm sorry I don't know of any videos with women with hair there, we all have our tailored interests...
Perhaps one who enjoys underarm hair may be persuaded to braid it? (No, maybe not, that might hurt).
I suppose it could be useful to a tickler with this interest if fingers can be caught in underarm hair... (Not that I want to find out!)
Perhaps as punishment for not shaving?