Sex Grease

Last night, I went to a friend's bridal shower and got a little lost in the neighborhood because someone didn't tell me that I should take the elevator when I exit the subway station instead of walking through the tunnel out of the station. I arrived at the shower just in time for "Bridal Shower Mad Libs", my friend made up a story about the bride-to-be (BTB) and she gave us 2-3 cards each and we had to fill in a noun, adjective, or verb. Afterwards, the BTB opened her gifts and she got some really nice things, however the only thing I can remember is a few "naughty' gifts that she got, "Sex Grease" being one of them. What is "Sex Grease"? Use your imagination : )