From religious perspective . Pre- Marital relationships are not allowed in Islam. Abhi Kar low jo karna hay. JUb qiamat main chitar parhain gay to pata chalay ga , bachoo.
Agreed no they are not allowed. However what if either man/woman had pre-marital relations but repented. Some people go astray but come back to the right path, doesnt mean they should be shunned. Who are we to judge & leave the judging to Allah. People do change.