hi bigal tried it and loved it.if its your first time tell her to take it slowly until you get used to it plenty of lube and slow penetration.iasked my missus and its was really funny because i just said to her in the heat of the moment... iv'e been a bad boy what would you like to do to me as punishment and she said what would you like me to do so i produced some dildo pants for her as a present which had a nice six inch dildo on the front and two inside for her this also meant she could enjoy herself too.never looked back since that fine day man it was so cool.
Word of caution, from my perspective, the arse is not over blessed with internal feelings, so it can be a bit like waving a wand in the Albert Hall, depends what you are used to, but for the experienced anal practitioner you might just want to go with knobbles, bumps and ridges or it can all be something of a mega letdown.
Just my perspective as l say, and Mega Three Bangs does kinds prepare you for disappointments!!!
Idon't know the answer to your problem .just pursuade her it would be great to try it one more time and just keep on pushing back she might get the idea you really enjoy it and go a bit faster if you say it 's so good give me some more . i don't know if she really doesn't like doing it your stuck. You could allways try a dvd maybe and talk during it hinting it looks good do you fancy a go for some. No clinical ideas for you just perseverance maybe good luck have fun
This is pretty much my answer to any strapon related problem!
If you get her these to try out, then they wont only be for you, so she might be more inclined to give you what you want seeing as she'll be getting what she wants aswell!