No merely this is no ground for terminating the services of employees if they have affairs with other office colleagues unless their personal activity badly affects the ultimate result for which they are employed.
Everyone has personal life and he/she cannot be stopped from entering in any relationship with his/her co-worker in the same organization.
The privacy in life for all human beings has to be preserved and protected not infringed by others.
The word “affair” is very vaguely used, either define in details what all activities are being prohibited during office hours between anyone having personal affairs or relationship with other colleague than only some meaningful result can be obtained by circulating any notice to employees of the organization.