Having an all consuming love at 16 that doesn't last is a rite of passage, a part of growing up and gaining emotional maturity. If we don't want our kids to have any life experience then perhaps we should just chain them up in their rooms from the age of 12. At least if you were there for your kids when it was happening, you have more chance of being supportive and seeing them through when it ends.
Cleansheets, in the eyes of the law a 17 year old is a sexual adult, capable of consent. Are they emotionally immature? Yes. Life experience, such as consensual and committed sex, is how they learn and grow. But if your 17 year old has the same emotional capacity now that s/he did at five, there's something badly, badly wrong.
And nobody is talking about marrying off a 17 year old. What on earth are you on about?
We're talking about letting her have sex in her own bedroom with her adult boyfriend of almost a year.
You seem to have a dreadful amount of disrespect if you think a 17 year old is the same as a five year old, and completely sexually unaware and immature. You also seem to think that anyone who finds an alternative when denied their own bedroom to have consensual, committed, adult sex in must be some sort of nasty deviant who just loves having sex in dirty toilets (I've never done that, thank you). You think a 17 year old is like a five year old, you think committed and consensual adult sex is 'being married off'.
You also don't seem to grasp that just because a person CAN have sex in their room doesn't mean they MUST. Allowing them that space as theirs gives them that much control. And as I've said before, it means your teenager can kick him out any time she likes, without being left stranded somewhere on her own.
The more you write, the more repressed and disrespectful I find you, and the more your rants are going from merely daft to downright disturbing.