Greetings.
The watery discharge you get on arousal can be discharge from the Skene's glands. The Skene's glands are small glands on either side of the vagina whose main function is to secrete a clear watery discharge to lubricate the vagina during sexual intercourse. In most women, this discharge is minimal and not noticeable and is sufficient enough to just lubricate the vagina. Some women may get increased secretion form these glands suddenly at some point, even when the discharge is not much at other times.
The other condition to be considered is cervix erosion or ectropion. The cells of the mouth of the cervix undergoes certain changes (from squamous to columnar cells) and these cells can produce a large amount of clear discharge. Ectropion is also sometimes called erosion, which is not a correct term and should not be used. Ectropion usually does not need treatment, as it is usually an asymptomatic diseases; except in the occasional occurrence of excessive mucous discharge or spotting that is very bothersome to the woman. Ectropion is eversion of the cervix. Following treatment can be done;
1) boric acid suppositories 600 mg vaginally at bedtime
2) cryocautery
3) electrocautery
Please read the following resource:
http://health.allrefer.com/health/cervical-erosion-info.html
http://www.wdxcyber.com/dxcxl007.htm
Please feel free for your follow up questions.
Dr. Arun
Doctor (MD)
MBBS, MS (General Surgery), Post-doctoral Fellowship in Sports Medicine