1. happy_sex is open to all sexual practices, while sex in theory means penetrative_sex only (but, in practice, the latter kind of is open to all sexual practices too, which just gets confusing and undecided; I'd appreciate if people formally resolved what sex means exactly) 2. happy_sex and happy_facial are specifically for situations where the female participant is cheerful, a rule that apparently has been followed accurately. 3. Uh, and happy really should not tag images of happy_sex? That sounds weird, frankly. Especially when we can search for happy rating:s and whatnot.