So what motivates athletes to play? Does their motivation for playing affect their attitude towards the sexual orientation of others that play with or against?
I think their are three reasons we play: 1-material, 2-glory, 3-fun. The three aren't exclusive but if the balance is toward any one of them I think it affects the individual's attitude toward the game, health and position on inclusiveness. If interested mostly material one would expect the player to view all other personal positions in terms of "What's in it for me?" "Would accepting gays hurt my financial position?"
If glory is the primary motivation I think things could go either way. The Greeks - who were polytheists - did not display any signs of discrimination against men who had practiced homosexuality in their youth (post-puberty) and likely still did so as young adults. (You can't have a relationship between a youth and a youngster without both being willing participants. And who believes that many did not continue the practice for life, despite being "married".) They played for glory. Athletes in the USA today often play for glory and will even sometimes take less money to be on a winning team or one on which they feel they will get a chance to play. Their attitude toward inclusion is less likely to be negative as long as they standout and/or the team wins.
Those who play more for the pure joy and exhilaration that a controlled adrenaline rush delivers are more likely to be inclusive in my opinion. They have nothing to lose by being inclusive and everything to gain by competing against the best in their sport rather than just the best straight people in their sport.
I curious to know what others think about my little theory.