Which would you rather give up for a weekend — sex or your iPhone? 15% of respondents to one study said they would choose a romance-free weekend rather than go without their beloved device.

A recent survey conducted by Gazelle.com (the company that buys your old iPhone) asked 1,000 people who have used the service to trade-in an old device if they’d rather go without sex or iPhone for a weekend. Yes, 15% of people chose sex.

This isn’t the first time smartphone owners admitted they would give up sex over their smartphone. In a related survey by another company, smartphones tied with intimate relationships as two things business professionals said they couldn’t live without.

But there’s another relationship between iPhones and people’s sex lives — nearly 4% of respondents to the Gazelle survey reported having used their iPhones while having sex.

A spokesperson for Gazelle said they were even more surprised at how many people said they would choose their device over Facebook.

“When asked which device or platform they would not be able to live without, a majority (65%) chose iPhone, while only a few (1%) report not being able to do without Facebook,” the press release for the survey states.

The survey was open to Gazelle customers for about one week. A spokesperson for Gazelle told Mashablethey wanted to make the survey available for iPhone owners because the questions related to that device. Check out some other highlights from the survey: