[morelisp]

If you say stuff like "people communicate and reciprocate love differently", then it's neither science nor pseudoscience.

If you say stuff like "these are the five specific love languages and everyone has two", that's either science or pseudoscience, and I'll give you two guesses how rigorously tested the hypothesis is.

Can't write a best-seller framed like the first one, though! People eat scientism up.