Watch 18+ videos on youtube without signin by rg

1. First get the Url of video you want to watch. As shown below.
http://www.youtube.com/watch?v=4Xkh6j7RMqk 

2. Then copy the Video Id. For above link video Id is 4Xkh6j7RMqk

3. Now paste the Video Id in the link given below.
http://www.youtube.com/v/VideoId?fs=1
Replace VideoId with the Id you copied in Step 2

4. Now the url will become as shown below.
http://www.youtube.com/v/4Xkh6j7RMqk?fs=1

5. Done. - 


enjoy.!!!