Dear Friend ,
Thanks for query to Health Care Magic ..
There is nothing to worry friend , Here are some information you should know to overcome your thoughts .
First you should have in your mind that Sperm is our own body fluid that is getting ejaculated during masturbation
Secondly Sperm will not cause harm to you if it comes in contact with body surface ,it will be liquified in few mins hence just a few wash with water and soap will do good in cleaning your body .
Thirdly you need not to scrub forcefully to make sperm off completely , its unnecessary , Sperm will get absorbed by body if you dint spill off completely , its a natural process .
Therefore there is no need to bath for 3 hours to clear off our own pure liquid in our body and it will be easily washed in 5 to 10 mins bath or shower .
Hope this information helps you .
Thanks & Take Care.