Well, chances are that while he was performing manual sex on you, he might have made one or more small tears in your vaginal tissue. The bleeding should probably stop fairly quickly, but you'll have to watch out for vaginal infections now since he might have had bacteria or something under his nails. You should definately see a doctor if the bleeding continues.
There's a really easy way to prevent this. Have him wear latex gloves while performing manual sex, and add in some nice water-based, condom-safe lube (like Astroglide or KY). It feels good, and lets you not have to worry about getting nasty infections. Get yourself and your boyfriend tested for STD's while you're at it, that's always a good idea if you're going to have sexual contact at all!
And just as a note, if you'll check the guidlines you agreed to when you signed up here...
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It's not necessary to post this both here and in Ask A Sexpert. This just helps us keep the confusion down. Thanks!
"Not everything in this magical world is quite what it seems"
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[This message has been edited by KittenGoddess (edited 10-23-2001).]