As recent as 2022 the SAU handbook only defines and recognizes martial relationships as “a man and a woman” scenarios. Discriminating on gender identity/ sexually orientation and un wed mothers. 

2021-2022 - Student Handbook states that:"We view all forms of sexual intimacy that occur outside of the covenant of heterosexual marriage, even when consensual, as distortions of the holiness and beauty God intended for it."
"Students who violate our community standards regarding sexual behavior will meet with an accountability committee and be treated in a loving redemptive manner throughout the accountability process. To that end, the University will offer counsel and support to encourage students toward living lives consistent with the biblical teaching on sexuality." 
"However, we do reserve the right to terminate or deny enrollment of those whose influence upon our community should prove to be in our judgment intractably contrary to the best interests of our students, and commitments to our university and to our Lord. Therefore, Spring Arbor University will not support persistent or conspicuous expressions or actions that are deliberately discordant with birth gender and will address such matters within the appropriate pastoral and accountability processes of the university."

https://www.campuspride.org/wp-content/uploads/SAUStuHandbook-2122.pdf