If you are having problems downloading the installer or it asking for a second disk, it is because the file is not downloading all the way to your computer.
To solve this issue, please delete the file you downloaded, then get yourself a
download manager which will help with this file and others. After you get the download manager installed then try downloading Sex Sim again. The download manager will allow the file to download properly.
Here are some links to popular download managers:
http://www.speedbit.com/http://getright.com/http://www.freedownloadmanager.org/If you continue to have troubles please let me know.