Dear {Name},
I am so sorry for sending you that NSFW {instant message/email/social media post} It was an error in judgment on my part. I thought it was {funny/private} but I now realize it was {offensive/inappropriate} and truly "not safe for work."
I hope I didn't get you in trouble with your boss or embarrass you. I'll understand if you want to block me after this.
Sincerely,
{Name}
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