It is pretty normal for straight guys to act weird or show off in front of gay guys, because they know on some level they're being judged (just like how they might be around a girl). It has nothing to do with wether he's attracted to your brother, just that he knows your brother is judging him in a different light.
He might be attracted to men though. Getting a hard-on from any physical contact is pretty normal for straight guys. Just try to rely on how you feel instead of those facts alone, cause might not be pointing to anything.
Is It Normal My boyfriend is always flustered around my gay brother
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It is pretty normal for straight guys to act weird or show off in front of gay guys, because they know on some level they're being judged (just like how they might be around a girl). It has nothing to do with wether he's attracted to your brother, just that he knows your brother is judging him in a different light.
He might be attracted to men though. Getting a hard-on from any physical contact is pretty normal for straight guys. Just try to rely on how you feel instead of those facts alone, cause might not be pointing to anything.