Originally Posted by Seaver

Sounds like a Yeast or other Urinary Tract Infection.

UTI's are known as the "honeymooner's disease" for a reason. His penis and sperm throw off the natural PH balance in your vagina. If it's been some time between sex for you (obviously it has), it'll take a bit for your body to adjust to it.

Go to your OBGYN, get a cream from them and it should clear it right up. IF it is something else, though, they will be able to catch it.