Know a little about this...our baby was born shorty after the 'water broke' while using a long shiny veiny black dildo on max vibrate.
Using a shiny material can be very important, some of those 'realistic' dummy cocks will have a horrible chemical odor to them, and you won't know until you have opened the vacuumed-sealed packaging (bought it) and it's too late. Trust your nose, it'll never lie.