I don't know if you have daughters Sriram: I have two (both adults now), and also two grand-daughters - and the scenario you outline above isn't something I recognise ever thinking as a father of daughters during their teenage years, and I doubt that any other father of teenage daughters would think like this.
In fact the dichotomy you portray seems perverse enough to read like an unpleasant pastiche of fatherhood in a draft script of 'Carry On Parenting': to be voiced by the likes of Sid James.
Hi Gordon,
I remember Sid James alright.....Ha..Ha. I agree that maybe I overdid the lighthearted father bit somewhat!

But the statistics about underage sex have something to say....
http://www.telegraph.co.uk/news/uknews/1574814/Britain-has-worst-underage-sex-rates.html (a little dated I agree but still fairly telling)
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More children are having sex in Britain than in any other country in Europe, according to World Health Organisation figures published on Monday.
Girls outstrip boys in the numbers prepared to have sex aged 15 or younger - leading to 20 of them getting pregnant each day.
The spiralling level of teenage pregnancy not only robs young people of their childhoods but contributes to a vicious circle of family break-up, say experts.
Four out of 10 girls in England have underage sex - more than in any other European country.
English girls were followed by Welsh girls - 39 per cent of whom had underage sex. Third highest was Scotland with 34.1 per cent of girls.
The number of boys in Britain having underage sex is 34.9 per cent and higher than every other European country apart from the Ukraine with 47.1 per cent.
And more than 15 per cent of the teenagers in England fail to use contraception.
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Quite clearly parents are either allowing this behavior or are just indifferent to it. Either way, it is quite clear that underage persons are having sex in large numbers. Saying that they are not capable of consent is obviously....farcical. That was my point.