for booty sex. also water based
Try saliva. Getting some booty alone should make you salivate, but if that’s not enough, get yourself a hard candy to suck on that makes your mouth water. Nothing is more slippery than saliva and when it starts to dry out, you can always add more. I personally would not recommend vegitable oils because they would be messy and you’d be washing the sheets every time.
most vegetable oils can be fun and since they ar enot petroleum based oils, they are probably fine for most uses.