Women are selling positive pregnancy tests on Craigslist. (Credit: Getty Images)

Pregnant women across the country have taken to Craigslist to sell positive pregnancy tests for about $25 a pop.

Some ads suggest buyers use the tests to finally get longtime boyfriends to propose. Others suggest pranking mom and dad. And one even suggests asking for money for an abortion and then using it to go on vacation.

"I will provide you with 1(one) positive pregnancy test with NO QUESTIONS ASKED. Taken same day," writes one woman from Florida. "It isn't my business what you choose to use it for!"

Home pregnancy tests work by detecting the pregnancy hormone, human chorionic gonadotropin, which is only present in pregnant women's urine.

Another woman in Toledo, Ohio, is asking for $10 plus the cost of the test. Like the Florida ad, this one promises not to ask questions.

"I will no [sic] take any responsibility for the test after it has been sold nor will I assume any obligations for the test after it has been sold," the Toledo woman writes. "What you do with the test is your business. I do reserve the right no [sic] deny any requests."

The ads appear in Chicago, Manhattan, Houston and other cities. Some have been flagged for removal by Craigslist, but new ads that have not been shut down remain.