Libertarians are out in force with ernie.cal: Legalize all forms of prostitution, no age of consent laws, polygamy, bestiality, and oh yeah, legal drugs to kill the pain for those seeking relief from the libertarian utopian visions. Get the government off our backs--so to speak! Say no to government coersion and yes to homosexual coersion, especially of children, puppies, and gerbils.
Correct me if I'm wrong but I don't recall James Madison and all writing one line, much less volumes, on the subject of homo-erotica in the Federalist Papers. But the Constitution is a living document, meant to change with society and the times (I said with thick sarcasm and irony for the apparent libertarian dilemma toward the living document argument).
The Homosexual Agenda is just the battering ram to society's laws and mores to advance the Sex Positive Agenda.
These hedonists take no moral opposition to any sex acts (including those you listed above). Rape is sort of bad to them because it may not include consent (although they don't believe that anyone is too young to consent), but rape fantasies are perfectly fine.
You can find some government links to the Sex Positive Agenda on this website which got hounded out of operation but still maintains a page of links to other sites:
Abstinence is considered evil in the Sex Positives' upside down world because it is the "denial" of sexual desires. Much as they encourage people to experiment with homosexuality.
Why stop there? If you have desires for a married person, go ahead and commit adultery. Want to fool around with relatives? Fine, although you may need to rent some sex rooms when you hold a wedding or family reunion. Kids? They've got to learn sometime. The family dog? He humps your leg and furniture, right? < /sarcasm >