Receiving a large amount of X-rated emails.

I have been getting a lot of emails relating to penis enlargement, local sluts, viagra, **** with teens, canadian ****, Hey...I want to meet you, etc. in my junk folder. It is very annoying to have to try to block these emails or use the manage rules function - which doesn't seem to work. I receive more of these emails than from people in my contacts or approved senders. I need a solution to this program, fast ... or I think I will have to close my account. How do I permanently get rid of emails of this nature?