Hello
Thanks for posting your query at DoctorSpring.com
I have gone through your question in detail and I can understand what you are going through.
The precum that you were having is a natural lubricant. When you get sexually excited by talking to her, your body gets ready to have sex and the result is the precum that you have. Its natural and not an illness.
Mostly if you get married, and start having regular sex then this problem will reduce on its own. In case if it still persists then it is called as premature ejaculation and good therapies for it. Its a type of anxiety disorder and the person normally suffers from performance anxiety where in he is anxious if he can perform or not.
First you can try the start stop technique. Your wife is supposed to start stimulating you and the moment you are about to ejaculated she is supposed to stop all the stimulaton and and hold your penis head hard. Now this should be repeated.
Perineal exercises also help. These are the muscle exercises that occur when you contract the perineal muscles like when you are trying to stop the urine or feces. You have to do this contrations repeatedly daily to tone up the perineal muscles.
One solution is medications. Some patients are not willing to wait for these acts to produce results and instead demand medicines. I prescribe them 12.5 mg paroxetine at night and they are doing good. Normally one should try until 25mg of Paroxetine. If paroxetine is not effective then Dapoxetine is an option. It has to be given 1 hour before having sex and will prolong the sexual interval.
Mostly you will not require any treatment and the problem will not exist when you get married and start having regular sex.
Hope this helps,
In case if you have any further query, do let me know.
Kind regards

Hello
Thanks for the follow-up question.
Yes you are right. When you are talking to her, you get sexually stimulated and hence you get the pre-cum. This is natural and will reduce ones you get used to her. This is not an illness or abnormality.
Regards.