Not every parcel that goes adult sees such a drop off, even ones with very hard core themes. However, for generic orgy rooms, the drop off is severe. Basically, from the data, one can see that instant low investment hook ups are something that the buys who pursue them are not willing to do even the most minimal work for. It's almost like a dog sitting under the table hoping for free scraps. However, for more specific fantasies, adult registration is not a barrier.