Quill wrote:We are beginning to experiment with anal play for both of us, but in the very very early stages.
You didn't mention vaginal

There's no age limit to start working muscles. It's probably the same for 'hole' muscles.
What I said about looseness also aplies to the vaginal muscles. Don't go too fast, pick a toy you can handle or just a bit larger.
Girls seem to prefer these for vaginal use:
Demi
Fennec Fox
Small Gryphon (the medium too, if you can take it)
Mini Seadragon. Though this one has been discontinued, there's the new Small Seadragon, though I can't say it's as good as the MSD.
I don't remember any girl talking about the small/medium Breeder... But I think those are good too.