Spreadsheets is an app that allows couples to track, improve and rate their sexual performance.

Products and services related to sex are a huge business, and a growing number of start-ups are looking to get a piece of the action.

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Whether its Bang with Friends, an app that pairs you with someone to "hook up" with, or Unboundbox, a subscription service that delivers sex toys and paraphernalia to customers, start-ups are leveraging technology to sell sex.

"There's a lot of innovation going on, but nothing had been touched inside the bedroom. It's considered so taboo, but it's an untapped market so we were really looking to create a product that would bring value to the space," said Danny Wax, co-founder of Spreadsheet, a mobile app that tracks data related to your sex life.

Wax, a former professional golfer, launched the L.A.-based company about five months ago and said that since starting the company has already seen a lot more players coming to the space.

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"There's really a barrier coming down," Wax said. "Everyone sees the size of the opportunity because everyone knows how big the sex industry currently is."