I've had a bit of a search and can't find this question but if it has already been discussed please ignore me.
I've never really understood the whole spit or swallow debate. Personally for me the more important question would be "cum in mouth or not?".
I love to cum in MrsD's mouth because it feels fantastic and because being allowed to do something so intimate does something incredible for me mentally. Whether she then spits or swallows doesn't really matter to me, truth be told I rather enjoy seeing it dribble from her mouth.
So my question is this. What is it that those who like to swallow and those who like their OHs to swallow like so much about it (other than it being a quick way to clean up)?