Ass licking feels amazing when you are on the receiving end. It's also a lot of fun when you're giving, and there will always be a lot of saliva involved with any kind of oral sex. But with ass play in particular, it's a big mental hurdle that some people have great difficulty getting past. And that's fine. Sex is all about doing what feels good and what you and your partner are comfortable with. But I will say this just make sure you've bathed recently before love making and let your partner know if they initiate ass play if you're open for business or not.
spitting is sou much more disgusting than ass licking, they could at least put a condom on the tongue, this way they avoid ass touching saliva as well.