you idiot! let that girl help, if she wants to bad enough, heh. Who knows she could become a Nissan fanatic too, one day youll come home to an SR20DET magicially dropped in your 240! lol we all wish that, at least. Worst case she will hate working on cars and give up, best case you got another wrenching partner to go along with the sex
EDIT: Even take her out their to start, and just start teaching her the basics of how a car runs and how to maintain, if you feel nervous letting her wrench on your car with little knowledge, thats what I do and 2 out of 3 girls actually liked learning how an engine runs, the other just left me, mumbling, "stupid cars....jackass....no time for me" LOL