Within traditional christian doctrine, Heaven is described as a place of perfection, love, and everlasting happiness. Beyond that, most details are quite sketchy. One additional detail that is given however is that at the time of the "last judgment" souls will be reunited with their perfected bodies.
The question then is will physical pleasure also exist and in particular sexual pleasure?
If it does, will soul bearing children also be created?
Will heaven have a population explosion?