What are Virgins Doing in Heaven?

Do you really believe that there are 99 virgins in heaven? Where in the world did a story like that ever evolve? Is this something you tell a teenage boy to get him to do what you want. Did God promise us 99 virgins when we die? Did you know that the guys ahead of me have already met and talked to the virgins and ....
Hey somebody is feeding you a line and this is getting old.