My girls aren't really at the right age for any of the topics but should they ever ask before I think they're ready I'll tell them.
Dd1 has already asked about bleeding from my 'bottom' I told her the truth that I was bleeding from inside my vagina and that it was ok because all older girls bleed. She was worried that I'd hurt myself!
She's seen me shave in the shower, she's never really asked about it though