My girlfriend and I are having difficulties with our double dildos. It seems that one side always falls out while we're having sex. If it was just one particular dildo that this happens with, I would just say it's the toy. But we currently use 4 different styles of double dildos with the same effect. Our favorite is the Nexus, but it still falls out relatively frequently. Does anyone have a suggestion for a better double? Or perhaps just pointers on how to not let it fall out? We've tried everything we can think of, so any suggestion we would appreciate! Thanks!