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plan b was pretty effective the 3 times i was forced to use it, but what else would you recommend?

Condoms. Plan B is well... plan B if those break, but at the very least you need condoms! I don't think they've ever broken for me so far and they protect against more nastyness.

Any guy too much of a cheap ass to get them, screw him! And with that, I mean don't. He doesn't value you enough.