Moved from Mykelti>:
2 HOURS AGO, SHARKERBABY SAID:
And my absolute last word on this subject... Kody's direct quote was “When you kiss the person that you kiss, the hormones go into your mouth and it registers certain things that will stimulate both the heart and the body for other reasons, ” While very clumsy and awkward, hormones do indeed go into your mouth and kissing does stimulate both the heart and body so yeah, he "wasn't that far off the mark" as @GOTHISH520 put it.
Except it appears the two things (the hormones and the stimulation) are correlational and not causal (which is reiterated by the last paragraph of the paper you quoted). After all, there's definitely a link between my alarm going off and the sun rising in the morning, but it doesn't mean that my alarm causes the sun to come up (or vice versa).
It actually would be easy to test in a way (have people gargle with "fake" saliva with the same concentration of sex hormones and see if it causes a change), so I wonder why no one has tested it--or they have and it's not been supported and thus not published.
I'm sure Kody heard it from someone and repeated it as fact. It's not fact, and so far there is no good evidence that the hormones in saliva swapped during kissing causes any response in the participants. Whether it deserves to be made fun of . . . well, this is a snark site.