All in all, if the girl loved her guy and knew he didn't deserve to be in there, she should be able to ward off strange cocks. It's not that hard to go without sex (what with all the porn, sex toys, etc. available); all it takes is a lifestyle adjustment at worst, unless you have zero self control. This is a good example of where toys come into play for women. Also, aren't women supposed to be better than guys at going without sex? Hell I've gone without sex for over half a year now by choice. A lot of people are like wtf but I'm happy with using the head between my shoulders to make my decisions. Took me a while to figure it out but life is much easier once you do.