Or word association basically.. Each user posts two words that go together, but you have to use the last word that the user before you posted and a new word that you think of yourself. For example,
"Shaving cream"
"Cream crackers"
Etc
Starting off with:
Erogenous zone.
"Shaving cream"
"Cream crackers"
Etc
Starting off with:
Erogenous zone.