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My own experience with Plan B type medication - once was enough to remind me that condoms or other forms of BC MUST ALWAYS be used. The side effects are very unpleasant (and I am a woman with mild to moderate menstrual symptoms anyway.)
Let's start with the nausea, which can knock you off your feet for the better part of two days. Then we'll get to the cramps, which feel roughly like someone has reached inside of your lower belly with a long needle and is poking your delicate insides repeatedly. Then, since you are nauseous and your tummy is hurting, you have the general flu-like symptoms of sleepyness and disorientation. All in all you are out of work or school or whatever you participate in for at least a day - physical pain is a good deterrent to repeat incidents.
The idea of a young woman trying Plan B once and then again engaging in sex that would require her to use it again in the same MONTH even is beyond the pale. Unless the young woman in question has a high tolerance for pain, she will learn from this experience.
And I am sorry Mr. Esser as you may be a very responsible and caring person, but YOU are not the one who has to worry about a pregnancy and YOU are not the one who has to suffer the long term effects of such a decision (legal and moral responsibility do not always coincide with reality). Nor are you the one who has to endure the side-effects of Plan B. Your questions are valid, but your real intent is clear. It would as difficult for you to understand this pain as it would be for most women to understand why it hurts you guys so much when your testicles are kicked really hard.