There is a tremendous difference between "never discussed" and "not brought up in public". Examples of topics that are discussed but not brought up in public are your child's struggle with potty training, whether you will provide them with birth control, whether anal sex is safe, when you and your partner like to have sex, when you intend to conceive, that weird discharge that sometimes comes out your nose, and what you will leave in your will.
Funny that you should make a leap from gay to sex and bodily functions. I’m pretty sure that being gay is not just about sex.
What about dating, relationships, marriage, and having a family? These things are commonly discussed at work. Fifty or sixty years ago being known to be in a gay relationship could be very professionally damaging.
> being completely taboo it was never discussed
> speaking one's mind in public nowadays is fraught with dangers.