By "questionable" I mean "can be questioned". I'm not using the euphemistic definition, whereby "questionable" means the question is already answered.
Dr. House behaves in a way that would generally be considered ethical, but that is at odds with medical protocol (because his cases are always exceptional and odd). Most people wouldn't call this wrong, but it is "questionable", when the word is taken at face value.
Huh? Casual sex can be an expression of nihilism and self-loathing, but aren't necessarily.
In theory, you're right. In practice, "hookup culture" is founded on the humiliation of the woman, which makes it an expression of loathing for humanity.