in case you haven't found it yet: there's a search function on this forum in the pink bar at the top ... search for STD and you'll find lots of discussion in previous threads.
but as wackojacko says, if there's any way that you can possibly avoid having sex with a girl who's had sex with hundreds (and possibly thousands) of other men who have themselves had sex with dozens of other girls before her each of whom themselves already had a sexual history longer than a phone directory etc etc, avoid it. Too risky.