yep, it always happens. there's a reason for it too, i can't remember exactly what it is but i read about it in sperm wars (http://s1.amazon.com/exec/varzea/ts/exchange-glance/Y02Y5974281Y8223367/qid=1016019573/sr=1-1/103-7161355-7600640), which was a great book.
it usually happens within about 30 minutes after sex, most often when you pee. your vagina actually squirts the sperm back out once the cervix is done sucking up what it wants. it's always a good idea to pee within an hour after sex anyway to prevent a bladder infection... i would go ahead and have your fun in all the places you want to try, but just try to get to a bathroom afterwards. most of it all comes out at once, so you can just clean it up and go on your merry way :)
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it usually happens within about 30 minutes after sex, most often when you pee. your vagina actually squirts the sperm back out once the cervix is done sucking up what it wants. it's always a good idea to pee within an hour after sex anyway to prevent a bladder infection... i would go ahead and have your fun in all the places you want to try, but just try to get to a bathroom afterwards. most of it all comes out at once, so you can just clean it up and go on your merry way :)