 First and foremost
You had one experience in the heat of the moment. So what? It happened once.
More importantly, you need to tell your wife what happened after she passed out and how you felt about it. THAT is way more important than if you are bisexual or not. I assume your wife is? Would be pretty...strange to think she would think any less of your interest in exploring your new feelings further.
But, you do need to talk to her about them.
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