Re:
Realistically, be with a girl whom you trust and has been tested recently and a condom is a mute point. Unless she gargles your *** then spits it into her pvssy and gets pregnant. Not sure if you'd have liability there, since it was her improper handling of hazardous substances that resulted in her pregnanacy.
Spring the condom thing on a girl during a hookup and she's not gonna suck on anything. Not unless it's flavored. And more than likely, not at all.
So again, I reiterate...don't get with sketchy girls who could have cold sores and you won't be worrying.
A_Unit