I also remember a little diagram of stairs. Each stair step had a level of intimacy, and it increased the higher you went up the stairs. It started at holding hands, then went to kissing, then to what they called the underwear zone, then finally to sex. They told us that the higher we were on the stairs, the more it would hurt if we fell off (symbolizing, I suppose, breaking up with someone). Then they told us to only go up the stairs with that special someone so that you don't fall.