New research suggests that same-sex couples face more obstacles to treatment for infertility than opposite-sex couples.

For the study, researcher Ann V. Bell and her colleagues collected and analyzed data from 95 people -- 41 heterosexual women of low socioeconomic status, 30 heterosexual men, and 24 women in same-sex relationships.

"These people are on the margins of our understandings of infertility, as it is generally viewed as a white, wealthy, heterosexual woman's issue," Bell said.

They found that same-sex couples often must undergo psychological evaluations before being treated for infertility -- a process that is not normally required for opposite-sex couples.

She also found that their experiences related to infertility were shaped by inaccurate stereotypes and that doctors often assumed infertility was not a problem for them.

The new study builds on her 2014 book Misconception, which focused on the 41 women of low socioeconomic status, as well as 17 women of high socioeconomic status, to explore social class and infertility.

Bell has extended her earlier research beyond social class to include the effects of infertility on men and same-sex couples. The "medicalization" of infertility -- studying and treating it as a medical condition -- is a process that has increasingly led to disparities and inequalities, she said.

"Most of the research out there is about women, even though just as many men are affected by infertility," Bell said. "It's still viewed as a woman's issue."

In addition, despite increasingly sophisticated medical treatments for infertility, such as in vitro fertilization, the high cost of many treatments and the "9-to-5 nature of medical practice" makes it hard for working-class people to afford the treatments or to access them while holding a job.

The findings were presented at the 110th Annual Meeting of the American Sociological Association (ASA).