I write about a lot of different kinds of sexual activities. Some are fairly common these days (face fucking), while others aren't so much (face slapping during sex). One of the more controversial subjects I've mentioned involves spitting on a partner during sex.
Spitting during sex squicks a lot of people out, understandably. In fact, spitting in general tends to gross most people out, and doing so during what's supposed to be an intimate encounter, logically, would tend to put most people off as well. But as we know these days, there are very few boundaries many people won't cross when they've both got all of those hormones coursing through their bodies mid-fuck.
With that as background, let's talk about spitting on your partner during sex.
Historically, spitting on someone is one of the penultimate insults. You show incredible disdain or disrespect for anyone you spit on; you're treating them as dirt or subhuman. And it's almost universal. I'm not aware of any culture on the planet that views being spat on as a positive experience.
For most people, their first exposure to spit play comes from having seen it in porn. And while I get irritated at people using porn to supplant legitimate sex education, porn can and does fulfill a role as sexual fantasy fodder for many people. So it's not uncommon for people to want to emulate something they've seen in a video they find interesting or erotic. And in my opinion, as long as both partners are willing to give it a shot, who cares how degrading or disgusting anyone else might think that is.
Like many other "degrading" acts you see in porn, you almost invariably see it manifested as men spitting on women. But from my conversations with various people about this, spitting appears to be a bit more egalitarian in nature than, say, slapping. One woman told me she and her boyfriend routinely spit on each other during aggressive fucking sessions. He gets just as much out of her spitting in his face as she does from him doing her when their sex play gets really hot and heavy. She added he finds it quite arousing to have her spit on his cock during oral sex. (Most of the article from this point forward is written using a male/female dynamic, but it could easily involve any gender combination).
Many people like to believe porn "invented" spitting in another person's face during sex, but that's hardly the case. Certainly it may not have been as well-known as it is today before porn, but there are historical anecdotes of people spitting on one another during intercourse (just as there was for ass-to-mouth oral sex, facials, slapping, rimming, and many other acts seen as "degrading" by various subsets of the population). This is not to say that the acts weren't done specifically to degrade another person, however.