Ultimately though, people should play the game they want to play. All gay, all lesbian, all straight or everything in between, none of that really matters. You are playing your version of Captain Steele and how they end up getting their rocks off is your choice, as is how you present them to the galaxy.
My main Captain Steele is a human male, the majority of sexual encounters I go for him are female and I would consider him straight. If he rams his dick into some guy's ass, its probably because that guy was trying to shoot Steele in the face. And not the fun kind of shooting. At the end of the day, he's the one curling up with Anno or Paige or Ramis in a warm bed.
My alternative Captain Steele is a cowgirl amazon, the majority of sexual encounters I go for her are female. And she never takes a dick. Does that make her a lesbian? Well, what if we consider her encounters with Yoma? He's male, she's female, that's the definition of straight, even as they're massing their pussies together.
At the end of the day, people will play the game the way they want and they'll find enjoyment in that.
And let's be honest here, I think most, if not all, people are going to pay attention to the dick flopping about in front of them and likewise, they'll try to avoid looking at the soaking wet pussy of the enemy. Its kinda hard to ignore that when its being shoved in your face by the enemy.