"Sneaky Relationships" As Recommended By My Girlfriend

Alright, so I got asked to write an article first on homosexuality, then on "sneaky relationships".
That's pretty vague but I'm going to have a crack at a relationship, probably a teenage or pre-age of majority relationship, which involves the parents of one or both parties being oblivious to the relationship.
Why parents? Because by the time you get to an age where you think relationships are important (or worthwhile at all), you should have no problems with telling people about who you're being sexually frustrated with. Right?

Anyway, once the topic was explained as "hiding it from everyone", I excluded the word "everyone" and replaced it with "their parents", because if you're afraid of what your friends think about your choice in women, kill yourself.

After much consideration absolutely no time or preparation at all, I decided that I didn't want to talk about the relationships as much as I wanted to talk about parents who indoctrinate their children, and deny any sort of social maturity until their age of majority (and in some cases, until they move out of home and can support themselves).
Their argument is "while you live under this roof", or "it's my house, it's my rules". But we're not talking about a fucking house; we're talking about an imperative part of social growth and maturity within humans. The entire argument that you must obey the parent because you happen to live with them is fair in some aspects (especially when it comes to things such as drug abuse and underage drinking/smoking), but totally ludicrous in this context.

Now yeah, some parents know better than their children, and I agree that it is important to instill important life lessons into your children at an early age, but sheltering them is just going to make them crash socially once they're not "under your wing". This entire idea of "not allowing your kids to progress socially because you're afraid they'll make mistakes" card is overdone and outdated; after all, if you haven't taught your teenager about safe sex, appropriate alcohol consumption, and that DRUGS ARE BAD LOL, then by the time they're 16 and legally allowed to have sex (by Australian federal law), you're never going to teach them.
As for relationships: why does it have to be sexual? How can the parents fully and aptly assume that if they start holding hands, it means that he's sticking it in? And more importantly, how have we gotten to a stage in our society where we'll let 13 year old kids watch R rated movies with horrific violence, but shudder in fear at the slightest idea of a natural human physical and biological interaction?