Why could sex cause vaginal infections?

Anonymous

In the past month an a half, my girlfriend has had two instances of vaginal yeast infections after we had sex. We don't know if we are doing something wrong or not, because her mother told her to stay calm, because this can happen for women every now and again. But it seems that the second episode came so quickly after the first... what could we be doing wrong? Should we go to a doctor? Has this ever happened to you?

I am worried because I don't understand what could be the cause of this.. we made love exacly the same way and in the same circumstances as every day before, nothing changed.. Could it be that maybe the bed sheets weren't clean enough? Could it be that I ate an orange or that I hadn't brushed my teeth before eating her out?

Why could sex cause vaginal infections?
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