How Inappropriate

It is someone's birthday party, and we wander in from the streets to a darkened room. Before a get much of a chance to look around, Kathryn exclaims, "I know, let's go swimming!" I think, "Great!" and when I turn around, everyone has started to climb into the bathtubs of varying shapes and sizes that line one wall, on tiers. Kathryn has taken off her pants already (and is wearing some modest black briefs underneath), and climbed into the highest tub already. I look around and everyone else has started climbing into the remaining tubs, still clothed. Groggily, I stand there wondering what to do, and it finally hits me that everyone is going to have to take off all of their clothes eventually. I go, "No... no, this is really inappropriate..." trying to remember what underwear I am wearing.
A boy about fifteen years old catches my eye as he passes by. I start up a conversation, trying to avoid seeing all of my friends taking off their clothes. Then I find myself kissing the boy. (AGH! How disturbing is that.) When I look over to the bathtubs everyone has fallen conveniently asleep. Then we fall asleep on the floor.
When the boy and I wake up, everyone else is still alseep, so he whispers to me that we should go get coffee at a cafe he knows of in the Faubourg something-or-other, just around the cover. This doesn't make sense to me because we are on the Ile-St.-Louis, and I thought all the Faubourgs were on the west edge of Paris. He gives me directions and I start to follow them. For some reason he does not come with.
I am surprised when the directions he gave me lead to real places, because all of the street names were Italian. Eventually I come out on top of Montmartre (this does not make sense, given the direction I was travelling), into a cirlular place (une place, not a place) with a large sculpture in the center that I have never seen before. It is covered with black grime, but I can tell that it was carved from bright white stone. As I get closer, I get the chilling sense that it represents something terrible.