I don't think it would be so much that spam is being made, but more that it would simply add a place for fun, non-serious adult conversations, which I'm sure many people would enjoy. And then we could also have separate serious mature conversations. Mature has a few different meanings- it could mean serious, but it could also simply mean "18+" conversations, which can just be for fun. Like "General Adult Conversations" or something.I do think that there should be a separate area in the Mature Discussion (sub-forum would be best in my opinion) for adult related content. Or add prefixes so people can filter out topics they may be more sensitive to.
But making an area as a place where non serious threads can be made, I think kind of ruins the whole point of said thread being made. As was pointed out before, a satire thread looses it's meaning and purpose when everyone knows it is satire, and it can also become more of a joke thread with people playing along. Though satire can be a strong way to show one's opinion at times, if it creates problems like the one it did, or encourages spam, I think it would be a better idea to just not allow it.
I don't see anything wrong with satire. It can generate a conversation just as well as anything else.