BuddyPress.org

I would suggest you use the BuddyPress Profile Fields to record this information — you can view the template used on the registration screen at bp-default/registration/register.php. You can then pull the information out of BuddyPress and just feed the variables to your existing “grab content” query.

See xprofile_get_field_data() in /buddypress/bp-xprofile.php how to retrieve/set this information programatically.