"No good can come of pre-teens experimenting with sex,"
Not true. Sexuality doesn't start at 16; it starts at the beginning of life; it grows out of sensuality and physical love. It grows out of the way your family treats you and cares for your body and out of their attitude toward the body. Being comfortable with your body means that as you grow older your exploration of your sensuality broadens from the childish "everything is yummy sensation" to playing with your genitals, comforting yourself etc. Sex is a lot more than intercourse.
"and that's exactly what MTV etc. encourage them to do. Little girls want to be grown up and socially accepted, and boys want to put their virgin weiners into anything that's warm."
This is not pre-teens experimenting with sex; it's adult sexuality being peddled to girls and boys who are looking for ways to act grown up. I agree that it's crap and not good for kids. But then I don't think any of the commercial crap is good for anybody.
"Nor is it smart for teens to indulge, given the Irresponsibility of boys leading to the dangers of pregnancy and disease."
That's why sex education and openness about sex is very, very important.
"This is not 'prudery.' It's basic to caring for a child."
Well, it sounds a little prudish to me. Moreover, a pre-teen is not a child. I remember. When I was thirteen years old I could have a full-body orgasm just gazing intently at the fourteen year old boy I happened to lust after at the time. During adolescence we give birth to our "adult" physical and psychological selves. Sexuality isn't something that happens overnight or something that happens according to a rule book. It's something that we nurture and grow into. But I agree that watching MTV is more likely to hurt than to help that process.
Joanna