Don't worry America -- the guy who got his nads bashed about a million times on "America's Got Talent" this week, tells TMZ ... his family jewels are totally fine.

In case you missed it ... Zac Gordon -- known as "The Horse" -- shocked the audience with his talent when he let people KICK HIM IN THE NUTS ... break boards on his nuts AND smash a cinder block with a sledgehammer ... on his nuts!!!!

Now Horse assures TMZ ... contrary to how painful his act looked his balls suffered no injuries and tells us, "No cup! I've been doing this 10 years and I'm healthy as a horse!"

Gordon also tells us he's previously consulted with his uncle -- who is a doctor -- and his "talent" is not a medical concern.

Good thing because Howard Stern, Howie Mandel and Sharon Osbourne all said yes to his nut-smashing skills ... sending him through to the next round, where he's sure to take another beating.

Balls. Of. Steel.

Howard Stern has proved ... he's NOT the dangerous, vulgar maniac the Parents Television Council warned he would be on "America's Got Talent" ... so says Howard's wife ... who insists the King of All Media is now "kid-friendly."

Beth Stern flew in to L.A. yesterday to promote her new HGTV show "Mom Caves" ... when we asked how she felt about all the flack Howard was getting from the powerful TV  watchdog group.

As we previously reported, the PTC begged "AGT" advertisers to boycott the show ... claiming he would corrupt America's children with his provocative ways.

"Once they obviously start watching, they're going to see they have nothing to worry about ... I think it's kid-friendly," Beth said.

She added, "He's compassionate ... yet he's a very good judge."

Howard Stern's first night on "America's Got Talent" started off with a bang ... he was articulate ... he was funny ... and he totally made fun of a male stripper for having a small wiener.

Howard entered the "AGT" studio in Los Angeles to a thunderous ovation ... impressed with a series of real, thoughtful critiques. He even had a touching moment with a father-daughter act ... praising them after an emotional performance.

But not everyone got a piece of Howard's nice side -- some stripper magician guy tasted some of Stern's wrath after what could only be described as a terribly disappointing performance.

"I had a lot of hope for you ... I was really rooting for you ... I wanted to see some magic and all I saw was a guy with his pants off ... and a rather small package."

After ripping on the dude's "man boobs" ... Stern added, "Don't feel bad, I'm in the same boat my friend."

PIZZA FEARS NO ONE ... especially not a group of angry Howard Stern-hating parents -- which is why Pizza Hut is refusing to pull its advertisements from the controversial new season of "America's Got Talent."

A rep for the Pizza company tells TMZ, Pizza Hut has no plans to remove its ads from the show -- despite the Parents Television Council clamoring for sponsors to yank their support over the show's new judge ... shock jock Howard Stern.

The rep tells us, "Pizza Hut strives to maintain the highest standards of quality and excellence in our communications to the public. Our advertisements are no exception, and are designed to draw attention to our products and appeal to a broad audience."

The rep adds, "Unfortunately, we may not always success in generating a positive impact on every guest, and we apologize if our methods offend some."

Pizza power.

Before Jimmy Fallon's big interview with Barack Obama last month, the talk show host reached out to several people for advice ... including the King of All Media himself ... Howard Stern.

Stern appeared on Fallon's late night show last night ... and admitted he almost ignored Fallon's plea ... because he's "somewhat evil" and couldn't figure out what was in it for him.

But the "America's Got Talent" judge ultimately decided to help ... and says he encouraged Fallon to ask Obama about the following subjects:

-- How big is your penis, Mr. President?
-- How often do you have sex with Michelle?

Unfortunately, Fallon didn't take Stern's advice.

But Jimmy DID manage to piss off Howard when he revealed who else he called on his quest for interview advice ... including Jay Leno.

Stern shot back ... "I never would have answered your email if I knew you called Jay."

He wasn't kidding.

The Parents Television Council is seething with anger over Howard Stern's new gig on "America's Got Talent" ... so they fired off a scathing letter to ALL the show's sponsors, threatening them to cut ties or face their wrath.

TMZ obtained a letter -- written by the PTC -- that was sent to a whopping 91 advertisers and commands them NOT to invest their millions with NBC's tent-pole talent show ... because they feel Howard Stern will corrupt America's children with his provocative ways. 

In the letter, PTC cites Stern's violent and crude language as reasons to boycott the show, quoting his comments on former "American Idol" winner Fantasia Barrino: "Hey Fantasia, you’re not getting little boys hard. Nobody’s beating off to you. Little boys want boners. They want a Britney Spears or a Rihanna."

The PTC blasts Stern's talent-judging qualifications -- saying he's only an expert at "looking at insecure, naked young women and telling them whether or not they were hot enough to pose for Playboy."

PTC's threats can't be taken too lightly ... the advocacy group targeted MTV's "Skins" and NBC's "The Playboy Club" ... and BOTH were later cancelled -- though neither of them drew the ratings of 'AGT.'


If advertisers choose to cut ties with AGT ...  it could mean MILLIONS of dollars lost for NBC.

So we gotta ask:

Judd Apatow tells TMZ ... he still considers himself Howard Stern's "biggest fan" ... even after their crazy Twitter feud this week.

Apatow was leaving the London Hotel in NY last night ... when we asked about the supposed "war" between the two media moguls that raged after Apatow criticized Howard's Sirius XM radio show on Twitter.

FYI -- Judd had complained Stern was spending too much time talking about "America's Got Talent." Stern shot back, "Hey man, do I talk about that last sh**ty film you made? I keep it to myself ... If you're not down with it, get the f*ck off my channel."

But yesterday in NYC, Apatow reaffirmed his love for The King of All Media ... telling us, "I'm his biggest fan."

As for whether Judd will actually watch "AGT" when it premieres with Howard ... check out the clip and find out.

"Howard Stern Show" Wack Packer Eric the Midget was surrounded by two hot, freaky strippers in Hollywood -- and looked terrified by the whole experience. Watch this ... and you'll understand.

Jennifer Hudson says she never considered Simon Cowell to be mean when she was on "American Idol" ... but the thought of facing Howard Stern has her quaking in her boots.

Relax, Jennifer ... he's awesome.

"Scrubs" star Zach Braff says he's never, EVER watched an episode of "America's Got Talent" ... but he's such a fan of Howard Stern ... he's willing to give it a try.

One down. 16 million to go.

"American's Got Talent" honcho Simon Cowell thinks the Parents Television Council has NOTHING to worry about now that Howard Stern is joining the show ... telling TMZ, "If he goes too far, he'll be kicked off."

Cowell just called in to "TMZ Live" ... telling us he thinks Stern is way too smart to cross the line on the show -- "He's not stupid, this guy."

"AGT" judge Howie Mandel also called in ... telling us the PTC is "ignorant" for attacking Stern ... claiming, "It's ridiculous to think that he's bringing the Sirius show to 'America's Got Talent'."