Some sound advice from the ladies.
I would like to reiterate that yogurt is a god send. I took a break from eating yogurt and bam got a yeast infection. Also cranberry juice is your friend.
Like ng said, don't let the penis touch you anus before penetration, that can be bad news. Also, remember to pee right after sex. It breaks the feel good after mood, but it saves much pain later. Everytime I don't pee after, I get an infection.
I have had the chronic yeast and UTI infections and they are the worst. But follow the advice posted here and you should be back on track in no time.
Oh yes, and get your man checked. Men can carry a yeast infection with no symptoms. He may keep giving it back to you.
Good luck!