Girlfriend and I have tried using a dildo (about an inch or two in length) in her anus and myself in her vagina, with me behind her. I had to relax her and get her in the mood, but after that it was a lot of fun for both of us.
Once she flipped over and wanted to have sex, using lots of lubrication I slipped the dildo into her ass and then penetrated her vagina with my penis.
She never asked me to stop, never wanted to slow down, and received no other complaints. The dildo itself only moved a couple centimeters either way once the heavy thrusting began, but hey, we both enjoyed the stimulation (she gets it twice, and I get a more tighter feel).
We've done this on multiple occasions. She loves it. =)
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"You looked at me as if I was eating runny eggs in slow motion." - Gord Downie of The Tragically Hip
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