该短语最常见的英文表述为：“Once you go black, you never go back.”
这是一句在美国流行文化中广为人知的俚语，其含义通常被理解为指代一种特定的性偏好或刻板印象。
需要注意的是，该表达具有明确的性暗示内涵，且常与种族刻板印象相关联。 在正式或日常交流中使用此表达可能引发冒犯或误解。若需表达“晒黑后不易恢复”之意，正确的英文表述应为：“Once you get tanned, you'll never be white again.”
若用户意图寻求更中性或委婉的表达方式，可参考以下替代方案：
- Once you've dated a Black boyfriend, you won't want to go back.
- After experiencing a relationship with a Black boyfriend, it's hard to go back to anything else.
- Dating a Black man can change your perspective on relationships.