I am not stating this to make people mad. I am a huge Carpenter's fan. There also nothing wrong with being gay. I am however convinced that both Richard and Karen were gay. Richard "Took after his mother" loved the piano and was "very close too her".
Karen was known as being a "TOMBOY". She was also killer on the drums. Her mom forced her to play instruments that were more "suitable for a lady". Karen also had a negative body image which of course caused her to die from anorexia.
I think Richard knew he was gay. I think Karen didn't know she was gay. Both of them suffered from some sort of addiction.