But he was Gay.

Just because David Ogden Stiers was gay, he came out in 2009, it doesn't mean that Charles would be gay. As noted in this post, Charles dated and had relationships with several women. Charlie was also worried about producing an heir, i.e. Charles Emerson Winchester ( Heal Thyself S8E17). If the character was gay production of an heir wouldn't have been an issue about which he would worry.