If she is from Jolo then you need to start feeling concerned Neil. Generally your GF will know where to take you and when and will take care of your security, you are afterall on her home patch. Thats not to say that you could get kidnapped etc ANYWHERE in Philippines.

First time I went 2 Americans were kidnapped by the Communists, and that was on Mt Pinatubo, near Angeles City (North of Manilla). The best looking girls are of course from MIndanao though, so take and risk and get some excitment in your life. As Keith says, your more likely to get mugged by some hoodies on your way back from the Kebab shop after a night out in UK.