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"Selling the OC" has really given "sugar daddy" seekers a major boost ... cuz this season they're peddling more than just homes -- with one dating site seeing a big boost of visitors. Instagram/@ashtyyn

Here's the deal ... on Season 4 of "Selling the OC," a website once used to connect thirsty young ladies with sugar daddies has been all the talk -- ever since Ashtyn was accused of meeting her husband, Jeff , on the site.

Turns out that's been great for business, because a rep for Seeking.com -- formally known as Seeking Arrangements -- tells us they've seen a major spike in women looking to live the good life jumping on the site ... especially in Washington D.C., L.A., Orlando, NYC and Miami. Gallery Launch Gallery

But don't quit those day jobs just yet, ladies ...

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