Normal affair or Extra Marital?

I think the only differences between the two are literary, as the feelings involved are usually the same in both a normal affair (when you're in a relationship, but not married) and an extra marital affair (when you're married and seeing someone else) - they are either lust or love, or both. And personally, I don't like either =D

extra marital is a sin..it brings the feeling of guilt,fear,shame and murder of conscience

Any affair after one gets married is called Extra Marital Affair, otherwise it is a normal affair. In certain societies relationship after marriage is not permissible or allowed, therefore, if one gets into any relationship, other than his/her spouse, it is termed as Extra Marital Affair.