User blog comment:James12708/Possibility of a Mass Effect 4/@comment-74.59.205.101-20121101214014/@comment-74.59.205.101-20121102003654

Liara is an alien, and she can have children with Shepard-- even with FemShep. If s/he was homosexual, then they would adopt one. The possibility of not persuing a romance is... dangerously low.

In wich case, they would simply let the player create an entirely new protagonist. I respect all opinion, but since most players actualy persued a romance-- with most being heterosexual-- I based my theory on this.