Swallowing might simply mean you don't want to spit spunk all over the place.
Learned that one when I was having a wank at the age of twelve and had nowhere to put it.
Mum was knocking at the door, so it was "down the hatch" so to speak.
Pretty much grossed me out at the time, but then it happened again a while later and I noticed it didn't taste so bad (actually, it didn't taste at all).
It's a bit like Truffles. Taste of nothing (maybe a teensie-weensie bit salty), but got a certain addictive angle at the same time.
Oooops. That's probably far too much information for me to be giving you guys.:tongue: