I think the definition of adultery seems to be different depending on the person. For Christian like me, I consider it any sexual lusts that is disrespectful and create unneccessary non-beneficial wants - such as having sexual thoughts about a person other than your spouse (this isn't an obvious sin for many people). Are you more righteous just by having the "right" sexual orientations? I think not. Is it bad to rape someone? Yes, gay or not this is sinful. Is it irresponsible to have sex with someone before marriage? I think so.
Being approving nor disapproving is not the main concern, but rather having the correct knowledges and reasons. But as a human being, we only have limited knowledge and wisdom. I personally don't approve of bigotry, and think as civilized people, we should be able to exchange idea and agree to disagree, for we are all sinners and have partial knowledge. For matters that are serious in nature, more investigation, inspection, and discussion are certainly needed, and laws are required so that people don't go around killing and raping people as they see fit. Nevertheless, I see too many people start jumping to conclusion based on ideology, religion, political standing, and even sexual orientations.