am not sure how they work as i have never used them before, but maybe try a female condom at first since it is onbviously safe material to be in a cooch... when i was younger, some boys used to blow up condoms to make ballons, so even an ordinary condom, providing there is no latex allergy... and unless she is used to ice play i would start with room temp water, and work way up or down... and just to make sure all is safe would try this all at home first.... just to see what happens...