I wanna make a dildo for gf(would post on DIY but no sex toy related threads allowed) and I know stainless is a common material for them, but it is abhorrent to work with. I have copper, magnesium, aluminum, wrought iron, low carbon steels like 1015 and 1040, low alloy steels like 5160 and 4140, and brass, will any of these react with her and cause ill effects, don’t want to be eating pussy and have it taste like pennies. Thanks