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Frisky sun worshipers are flocking to have sex on the beach in Provincetown - but are sending horrified family vacationers packing, officals said.

Angry Cape Cod National Seashore officials said they are cracking down on public sex acts along the picturesque shoreline after the number of citations for public sex acts more than tripled, from an average of 40 to 132 last year.

“This is not what we’re interested in seeing,” said George Price, Superintendent of the National Seashore. “Over the last couple of years, public (sex) acts like this have been viewed by visitors.”

Price said officials are baffled as to why the vacation mecca has suddenly become a hotbed of public sex for randy exhibitionists.

“Laws and enforcement have not changed - it just seems to be something that some people decided we want to see,” Price said.

Complaints have included whale-watchers sailing past large groups of nude men, and families stumbling upon people engaged in sex acts on the pristine national shore that attracts tens of thousands of vacationers from throughout the world each year.

One complaint, issued in 2007, was from a New Jersey family walking in the dunes who encountered couples and a large group of men having “sex in the nude, including oral and anal sex right out in the open,” the Cape Cod Times reported last week.

“The majority is gay, but we’ve had issues with hetero sex as well. Families are upset and outraged,” Price said.

He added that many gay community members are also appalled about the recent surge in public sex, which is illegal under federal and state laws and can incur heavy fines.

“It’s really two issues, one is the nude sunbathing, which has been around since the ’70s and ’80s, and that issue is being addressed.

“But the issue that we’re talking about today is public sex: It’s a seashore problem and it’s a town problem,” he said.