I wait till she swallows or spits it out and then wait another minute (kind of like the 10 secong rule) and then I figure it's safe to kiss or someshit. but after I finish generally I require my woman to fix me something to eat. and get me a tall glass of water, and it better not be tap.
I remember hearing some horror story about a girl going down on a guy and not swallowing but spitting it back out into a Coke bottle and putting it in the fridge...then inserting it into her later to get herself pregnant...hence screwing the guy over.
I know...not possible...but let it run through your mind a time or two..lol
I always kiss a girl after that - it's natural.
Way back in highschool I once had to taste my own sperm to show my girlfriend that there is nothing disgusting or humiliating in going down, swallowing and things like that - it worked well that time.