Alphabet Inc.'s Google in May introduced a slick feature for Gmail that automatically completes sentences for users as they type. Tap out "I love" and Gmail might propose "you" or "it."

But users are out of luck if the object of their affection is "him" or "her."

Google's technology will not suggest gender-based pronouns because the risk is too high that its Smart Compose technology might predict someone's sex or gender identity incorrectly and offend users, product leaders revealed in interviews.