hi..i have understood your concerns... the semen color may become watery and consistency may became like thin liquid, if u are masturbating very frequently...this happens because u do not have enough amount of semen for ejaculation when u masturbate or sex repeatedly..so dont worry..it is not a problem...u need not take any medications for that,, Premature ejaculation can be treated or controlled with the help of behavioral methods and the drugs.. The behavioral techniques u have to practiced during sex and does not expect the benefit from the first day.. it will take time.. your partner can also help u by participating in the behavioral intervention..these techniques are very difficult to explain here in detail…material is easily available on the internet. U can google the names of techniques, I am about to mention. Techniques are: 1. Squeeze technique 2. Start- stop method 3. Interruption technique U can perform these behavioral methods, they are easy to understand.. Premature ejaculation can be controlled by drugs.. SSRI antidepressant drugs cause delayed ejaculation as a side effect, and this side effect is used therapeutically in the treatment of premature ejaculation..these drugs are as following: Tablet. Paroxetine [paxil 25 mg] at night or Tablet. Fluoxetine [Prozac 20 mg] in the morning after the breakfast.. or Tablet. Sertraline [Zoloft 50 mg] at night. Increase the dose to 100 mg after 15 days.. U have to take this drug regularly and its effect will appear only after 15 to 20 days. So be patient for that.. Another strategy is to take drug one hour before sex..the another antidepressant drug dapoxetine [sustinex 30 mg] is given one hour before sex and it cause delayed ejaculation and sexual pleasure to both.. U shud practice the behavioral techniques first.. I hope u ll find this advice helpful..best luck..