Holding down a relationship with one person is complicated enough, but if you’ve got that nailed, or you just want to cast of the two-person-party shackles of society, then 3nder may be the next download for you.

Launched in London last year, the threesome app, currently only available on iOS, has just raised a $500,000 seed round from two rather shy angels.

“Now that 3nder is close to reaching a million downloads, and the number of users has been growing rapidly in the past few months, it is evident that momentum is building, and that Dimo has tapped an underserved market,” so said shadowy angel ‘Victor’.

“The beautiful design, as well as the improved usability of the last version, is attracting more users. We believe our investment will help growth by initiating active marketing and improving scalability for the next million users and beyond. Also, it will assist in preparing for a Series A in the following months.”

“Nowadays more people are looking for relationships that are designed with more freedom in mind,” explained 20-something founder Dimo Trifonov.

“Consensual non-monogamy for singles and couples is becoming more prevalent, especially among young people. We are building the first safe environment for open minded people where they can meet likeminded partners, and the response has been fantastic. We are also gender-blind and orientation-blind, so everyone is welcome.”

As well as prepping for a Series A round, the company is also beginning talks with investors and entrepreneurs who might want to help take 3nder to other parts of the world.