Sex, despite being one of the most fundamental human experiences, is still one of those businesses that some advertisers reject, banks are hesitant to financially support and some investors don’t want to fund.

Given how sex is such a huge part of our lives, it’s no surprise founders are looking to capitalize on the space. But the idea of pleasure versus function, plus the stigma still associated with all-things sex, is at the root of the barriers some startup founders face.

Just last month, Samsung was forced to apologize to sextech startup Lioness after it wrongfully asked the company to take down its booth at an event it was co-hosting. Lioness is a smart vibrator that aims to improve orgasms through biofeedback data.

Sextech companies that relate to the ability to reproduce or, the ability to not reproduce, don’t always face the same problems when it comes to everything from social acceptance to advertising to raising venture funding. It seems to come down to the distinction between pleasure and function, stigma and the patriarchy.

This is where the trajectories for sextech startups can diverge. Some startups have raised hundreds of millions from traditional investors in Silicon Valley while others have struggled to raise any funding at all. As one startup founder tells me, “Sand Hill Road was a big no.”

A market worth billions or trillions?