Technically, if you bleed from the penetration of a finger, you have broken your hymen and once this is broken, you (usually) will not bleed again from penetration of any kind. Whilst you have broken...
If you have a boyfriend at the time, then it can be seen as bad since you'll likely be hurting someone's feelings and showing betrayal to their emotions and trust. If you don't have a boyfriend at...
There's no physical development attached to losing it, so if the person changes afterwards it's purely psychological. The person most likely had a certain attitude towards it that made them think...
Virginity is something held by those who haven't had sexual intercourse, and to lose it you would have to have sexual intercourse making you no longer a virgin.