Romantic relationship quality is an important factor for well-being. Most research on romantic relationships is based on heterosexual couples, but studies of different types of dyads showed that relationship functioning among same-sex couples is similar to that among heterosexual couples. However, a few studies suggest that lesbian partners are better communicators and more satisfied in their romantic relationships. The present study aimed to replicate these findings with a sample of Swiss couples, as most of the previous studies have been based on US-American samples. Eighty-two women who were currently in a romantic relationship with either a male or a female partner completed an online questionnaire about their relationship functioning. Compared to heterosexual women, lesbian women reported receiving better support from and experiencing less conflict with their female partners. They also showed a trend toward being more satisfied in their relationship. The study supports the notion that, relative to heterosexual couples, the quality of support and conflict interactions may be enhanced in female same-sex couples.