Larian Studios Forums Baldur's Gate III Baldur's Gate III - Suggestions & Feedback Playersexuality discussion and its effects on Companion writing

Except you're never forced to be in a relationship with anyone except the person you choose to be. So it's not an issue.
It's not like you're forced to have a relationship with every companion. In fact you actively have to select specific things to be able to get into one. If you don't want to romance a person, then don't. Then their sexuality is irrelevant.