Women do not all think with one mind. You would need to ask her.
I imagine it feels painful because the hymen membrane (vaginal lips) is being stretched. Bleeding may occur the first time.
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The feeling is extraordinary. So much pleasure. That's if the boy hasn't wanked before having sex for the first time of course. If he's been wanking, there's nothing new. It's just like one of his hand sessions with someone in front of him.
For him it's just like having normal sex. There will be no pain or bleeding, just pleasure.
He feels stupid,smelly and left out he just lost his life and took apon his doctor and said virginity