We've had sex every other day since my period ended. I now have a uti. I typically get up and pee afterwards but a few tines over the last week I didn't, and sure enough I realized today I have a uti. Got some azo and found some metronidazole. This happens to me every year or so when we start having sex like crazy. Its frustrating. So.. Long story I know but has anyone used vinegar after sex to prevent that? I've never heard of it before a co worker told me.