Ruslan Schedrin, said to be 16, could spend a month in a hotel with X-rated movie actress, Ekaterina Makarova.
Astonishingly, Ekaterina,hasn't ruled out having sex with the teenager.
But his mum and sister are furious, insisting the prize is inappropriate for a 16-year-old(the age of consent in Russia), adding that he should be concentrating on his education.
"I didn't believe it at first, I thought it was rubbish.
"But when it turned out to be true, I thanked the website - I was so happy.
"I called my friends and they did not believe it either. They said, 'What are you talking about?' Now they are happy for me too. Some of them are envious.""I saw her and I liked everything. She has got good sizes.
"I am looking forward to our meeting so much - everything is boiling inside me. I am happy so much.
"I have told my mother and she has taken it badly, but I think we'll sort it out.
"When I meet the girl, I'll say, 'Hi, I am that very boy, I've won you.'
"I am absolutely against it. He has got exams, he is studying. What do you mean - a month with a porn star?
"This is not real at all -even a week is too much. They should give us 100,000 rubles (£931) instead - we'll be happy with it.
"Such a prize - how could they get such an idea for a 16-year-old boy? I am shocked. I have not seen the girl, but my son must study."
Ekaterina agreed months ago to be the prize in a competition for the 100,000th visitor to a new website selling virtual arms for video games...
"I will travel to Moscow and then the boy will decide.
"We will negotiate it with his mother too if he can live in a hotel with me, or fly with me somewhere. He has some exams and studies."
When asked if the prize included having sex with her, Ekaterina refused to rule it out, adding:
"It is not supposed but life is life.
"It is a usual thing when inexperienced boys are looking for more experienced girlfriends. I don't know. At least we'll be friends. I liked him in the photos.
"If he is not comfortable about a hotel, he can stay at home. He has to decide."