I use a damp sponge
A husband and wife are in bed for the night. The wife turns on her side ready to sleep, and the husband turns his bedside lamp on to read a book. As he is reading he slides his hand down her back, between her legs, fondles her briefly, stops, and them goes back to reading his book.
His wife jumps out of bed and starts to strip in front of him.
Her husband gives her a puzzled look and asked,
"What the hell are you doing taking your pyjamas off."
The wife replied, "You were fondling me, I thought it was foreplay for something a bit heavier."
The husband replied, "Hell no! I was just wetting my fingers so I could turn the page."